# Swine Manure Removal Systems for Grow-Finish Barns ## Key Takeaways - **Deep pit systems** offer minimal daily labor by storing manure for 6-12 months, but pose the highest risk of toxic gas (H₂S, CH₄, NH₃, CO₂) buildup, necessitating continuous, robust ventilation and strict entry protocols. - **Pull plug systems** provide periodic drainage of shallow pits (2-4 ft) to outside storage, balancing deep pit labor advantages with more control over application timing and reduced in-barn gas accumulation compared to deep pits. - **Flush systems** utilize water or recycled effluent for daily manure removal, significantly reducing in-barn gas levels and improving air quality, but require substantial water availability and large-volume outside storage capacity. - **Scraper systems** mechanically move manure without adding water, resulting in concentrated manure and reduced storage needs, but demand regular mechanical maintenance and are best integrated during new barn construction. - **Gas safety is paramount** across all systems; continuous monitoring for hydrogen sulfide, methane, ammonia, and carbon dioxide, coupled with strict confined space entry procedures, is non-negotiable to prevent asphyxiation and poisoning. - **Comprehensive recordkeeping** of pump-out dates, gas monitoring results, system maintenance, and manure nutrient analyses is crucial for effective nutrient management planning, regulatory compliance, and early problem detection. --- Managing manure in grow-finish barns is one of the most important operational decisions a pork producer makes. The system you choose affects daily labor, pig health, air quality, nutrient management planning, and your bottom line. This guide compares the main swine manure removal systems available for grow-finish facilities, explains how each one works, and gives practical guidance for choosing, operating, and troubleshooting your setup. It is written for farm owners, herd managers, and employees who handle day-to-day manure removal tasks. ## At a Glance Here are the most important takeaways from this guide: - **Deep pit systems** store manure under the barn for months and require the least daily labor, but they create the highest risk of toxic gas buildup and need careful ventilation management. - **Pull plug systems** combine deep storage with periodic drainage to an outside storage structure, giving you flexibility in application timing. - **Flush systems** remove manure daily using water or recycled lagoon effluent. They keep pits empty and reduce in-barn gas levels, but they produce large volumes of liquid that require substantial storage capacity. - **Scraper systems** move manure out of the barn on a schedule without adding water. They work well in regions where water conservation matters or where you want to keep manure more concentrated. - **Your choice depends on** your climate, manure storage capacity, available water, land base, building design, and local regulations. - **Gas safety is non-negotiable.** Hydrogen sulfide, methane, ammonia, and carbon dioxide can reach dangerous levels in any manure removal system. Monitor gas levels and follow entry protocols. - **Keep records** of pump-out dates, gas monitoring results, system maintenance, and manure nutrient tests. These records support your nutrient management plan and help you spot problems early. ## Understanding the Main Swine Manure Removal Systems Grow-finish barns house pigs from about 40 to 50 pounds up to market weight near 280 to 300 pounds. During that period, each pig produces roughly 1.5 to 2.5 gallons of manure per day when you combine feces and urine. A barn with 1,000 pigs can generate 1,500 to 2,500 gallons of manure daily. Over a full grow-out cycle, that adds up to a significant volume you must handle safely and efficiently. The four [dominant](/blog/careers/dominant-definition-biology) manure removal systems for grow-finish barns are deep pit storage, pull plug systems, flush systems, and scraper systems. Each has distinct advantages and trade-offs. Your choice depends on your specific situation, and many producers successfully operate each type. ### Deep Pit Storage Deep pit systems are the most common manure removal approach in the Upper Midwest and other major pork producing regions. The barn sits over a concrete pit that extends the full length and width of the building. Pit depth typically ranges from 6 to 10 feet. Manure drops through slatted floors directly into the pit, where it accumulates for 6 to 12 months or longer before you pump it out. The main advantage of a deep pit is simplicity. You do nothing with the manure daily. No water is added, so the manure stays relatively concentrated. You pump the pit once or twice a year, usually in spring and fall, when you can apply the nutrients to cropland. The biggest drawback is gas production. As manure decomposes in the pit, it releases hydrogen sulfide, methane, ammonia, and carbon dioxide. These gases can reach dangerous concentrations, especially when you agitate the pit before pumping. Ventilation must run continuously to keep gas levels safe for pigs and workers. During cold weather, maintaining adequate ventilation while also heating the barn can be a challenge. Deep pits also require careful attention to pit level. If you let the pit get too full, you increase the risk of gas problems and make agitation less effective. Most producers pump when the pit reaches 80 to 90 percent full. ### Pull Plug Systems Pull plug systems are a variation on deep pit storage. The barn has a shallow pit, usually 2 to 4 feet deep, with a plug at the low end of each pit section. Manure accumulates in the shallow pit for a set period, often 7 to 14 days, and then you pull the plug to drain the manure into an underground pipe that carries it to an outside storage structure, such as a lagoon, earthen basin, or concrete tank. The pull plug approach gives you the low daily labor of a deep pit with more control over when manure leaves the barn. You can drain pits on a schedule that matches your outside storage capacity and your crop nutrient needs. Because the pit stays relatively shallow, gas production is lower than in a deep pit, though still present. The main trade-off is that you need outside storage. The outside structure must have enough capacity to hold manure between application periods. In many cases, that means a storage structure sized for 6 to 12 months of manure production. Pull plug systems work well for barns built on relatively flat ground where you can gravity-flow manure to outside storage. If your site is not suitable for gravity flow, you may need a pump station, which adds cost and maintenance. ### Flush Systems Flush systems use water to remove manure from the barn on a daily basis. A typical flush system has a tank or pit under the slatted floor, a flush tank at the head of each gutter, and a collection channel at the opposite end. On a flush schedule, you release a large volume of water into the gutter, which carries the manure to a collection point. The collected manure and water then flow to a lagoon or other outside storage. Flush volumes vary by system design. Some systems use as little as 10 to 20 gallons per flush per gutter, while others use 100 gallons or more. Many operations flush each gutter once or twice a day. The flush water can be fresh water or recycled lagoon effluent. Using recycled effluent reduces fresh water demand, but it also adds solids and nutrients back into the barn environment. The primary advantage of a flush system is improved air quality. Because manure leaves the barn daily, gas production inside the building stays low. This can improve pig performance and worker comfort, particularly during hot weather. The primary disadvantage is water use and storage volume. Flush systems produce large volumes of dilute manure. You need a lagoon or storage structure large enough to hold all that liquid, and you need a way to pump or gravity-flow it to the storage. In regions with limited water or strict water use regulations, flush systems may not be practical. Flush systems also require more daily attention than deep pits. You must check flush tanks, timers, and valves regularly. A stuck flush valve can waste water or fail to remove manure, leading to gas buildup and dirty pens. ### Scraper Systems Scraper systems remove manure from the barn using mechanical blades that travel along the length of the pit or gutter. There are two main types: reciprocating scrapers that move back and forth, and cable or chain scrapers that pull a blade in one direction. The scraper pushes manure to a collection point at one end of the barn, where it drops into a cross channel or pit for transfer to outside storage. Scrapers can run on a timer, typically operating several times a day, or continuously. Some systems scrape only the shallow gutters under partially slatted floors, while others scrape the full width of the barn. The main advantage of a scraper system is that it removes manure without adding water. The manure stays relatively concentrated, which means you need less storage volume and you haul fewer gallons to the field. Scrapers also keep the pit relatively empty, which reduces gas production inside the barn. The main disadvantages are mechanical complexity and maintenance. Scrapers have moving parts that can break or wear out. A broken scraper can stop moving manure, leading to a rapid buildup of gas and unsanitary conditions. You need to inspect scraper components regularly and keep spare parts on hand. Scraper systems also work best in barns designed for them. Retrofitting a scraper into an existing deep pit barn is difficult and often not cost-effective. If you are considering a scraper system, plan for it during barn construction. ## Choosing the Right System for Your Operation Selecting a manure removal system is a major decision. You will live with the choice for the life of the barn, which is typically 20 to 30 years. Consider the following factors carefully. ### Climate and Weather Cold climates favor deep pit and pull plug systems because you can store manure through the winter and apply it in spring. Flush systems in cold climates require careful management to prevent freezing in pipes, pumps, and storage structures. Scraper systems can work in cold climates, but you need to ensure the collection pit and transfer lines are protected from freezing. Hot climates often favor flush systems because the daily removal of manure helps control ammonia and flies. However, flush systems add humidity to the barn, which can be a concern in already humid conditions. Ventilation design must account for the extra moisture. ### Water Availability Flush systems require a reliable water source. If you are in an area with limited water or restrictions on water use, a flush system may not be viable. Deep pit, pull plug, and scraper systems use little or no water for manure removal, making them better suited to water-scarce regions. ### Land Base and Nutrient Management Your manure removal system affects how you manage nutrients. Deep pit and scraper systems produce more concentrated manure, which means you haul fewer gallons per acre to meet crop nutrient needs. Flush systems produce dilute manure, so you need more storage volume and you apply more water per acre. Consider your cropland base and your nutrient management plan before choosing a system. If you have limited land and must export manure, a more concentrated product reduces your hauling costs. If you have ample land and want to use lagoon effluent for irrigation, a flush system may fit your operation well. ### Building Design and Retrofitting If you are building a new barn, you have full freedom to choose any system. If you are retrofitting an existing barn, your options are more limited. Deep pit barns can sometimes be converted to pull plug systems by adding drains and plugs, but this is a major construction project. Flush and scraper systems require significant changes to the floor and pit design. Before committing to a retrofit, get quotes from multiple contractors and compare the cost against the expected benefits. In many cases, it is more economical to build new than to retrofit an existing barn for a different manure removal system. ### Labor and Management Capacity Consider how much daily labor you can dedicate to manure removal. Deep pit systems require almost no daily attention. Pull plug systems need a few minutes of work each time you drain a pit. Flush systems need daily checks of tanks, valves, and timers. Scraper systems need regular inspection and maintenance of mechanical parts. Be honest about your labor situation. If you have a large operation with dedicated staff, a flush or scraper system may be manageable. If you are a solo operator, a deep pit or pull plug system may be a better fit. ### Regulatory Requirements Check with your local regulatory agency before choosing a system. Some areas restrict lagoon construction, limit water use, or require specific manure storage practices. Your local Soil and Water Conservation District, state Department of Agriculture, or county planning office can tell you what rules apply to your operation. ## Step-by-Step Guide to Operating a Deep Pit System Deep pit systems are the most common in grow-finish barns, so this section covers their operation in detail. The principles also apply to pull plug systems, with adjustments for the drainage step. ### Step 1: Monitor Pit Level Check pit level weekly. Most pits have a sight tube or a marked stick you can lower through a port. You want to pump the pit when it reaches 80 to 90 percent full. Pumping before it is full wastes time and money. Pumping after it is too full increases the risk of gas problems and makes agitation less effective. Record the pit level each week in a logbook or spreadsheet. This record helps you predict when you will need to pump and gives you data for planning future storage needs. ### Step 2: Schedule the Pump-Out Plan your pump-out around crop needs and weather. In most regions, the best times are spring before planting and fall after harvest. Avoid pumping when the ground is frozen, saturated, or snow-covered. Check your nutrient management plan to confirm application rates and field selection. Contact your manure hauler at least 2 to 3 weeks before you want to pump. Good haulers book up quickly during peak seasons. Confirm the date, time, and number of trucks you will need. ### Step 3: Prepare the Barn Before pumping, move pigs out of the barn if possible. If you cannot empty the barn, keep pigs in place but be aware that agitation will release large amounts of gas. Run ventilation at maximum capacity during the entire pumping process. Close all doors and windows on the side of the barn where the pump-out occurs to control air movement. Open doors on the opposite side to create cross ventilation. This helps move gases away from the pump-out area. ### Step 4: Agitate the Pit Agitation is necessary to suspend solids so the pump can remove them. Start with the pump running and slowly introduce the agitator into the pit. Work in sections, moving the agitator from one end of the pit to the other. Do not agitate for more than 30 minutes before starting to pump. The longer you agitate without pumping, the more gas you release into the barn. If the pit has a crust, break it up gradually. Do not break the entire crust at once. A sudden release of gas can be dangerous. ### Step 5: Pump the Pit Pump until the pit is as empty as practical. Most pumps can remove down to 6 to 12 inches of liquid. The remaining sludge will continue to decompose and produce gas, so do not assume the pit is safe just because you pumped it. Watch the pump discharge for signs of plugging. If the flow slows or stops, stop the pump and clear the obstruction before continuing. Do not put your hands or tools into the pump intake while it is running. ### Step 6: After Pumping After the pit is pumped, continue running ventilation at maximum for at least 24 hours. This clears residual gas from the barn. Check gas levels with a calibrated monitor before allowing workers to enter. If gas levels are above safe limits, continue ventilating and recheck. Clean the pump-out area and any equipment that contacted manure. Store agitation and pumping equipment away from the barn to prevent corrosion. ### Step 7: Record the Event Record the date, volume pumped, fields applied to, application rate, and any problems you encountered. This information supports your nutrient management plan and helps you plan future pump-outs. ## Step-by-Step Guide to Operating a Pull Plug System Pull plug systems follow a similar routine but add a drainage step. ### Step 1: Monitor Pit Level Check pit level daily or every other day. The shallow pit fills faster than a deep pit, so you need more frequent monitoring. Most producers drain pits every 7 to 14 days, but the exact interval depends on pig size, pig numbers, and pit depth. ### Step 2: Prepare Outside Storage Before pulling plugs, confirm that the outside storage structure has capacity for the manure you will send it. Check the storage level and compare it to the expected volume from the barn. If storage is nearly full, arrange to pump or irrigate before draining the barn. ### Step 3: Pull the Plugs Pull plugs one section at a time, starting with the section farthest from the storage structure. This prevents the collection pipe from overloading. Allow each section to drain completely before pulling the next plug. Watch the flow through the collection pipe to ensure it is moving freely. If flow is slow or stops, check for a plug in the pipe or at the storage inlet. ### Step 4: Replace the Plugs After each section drains, replace the plug and check the seal. A poorly seated plug allows manure to continue draining, which can overwhelm the storage structure or leave the pit empty when you want it to refill. ### Step 5: Rinse if Needed Some producers rinse the pit with a small amount of water after draining to remove residual solids. This helps keep the pit clean and reduces odor. Use only enough water to rinse the floor. Excessive water adds to your storage volume and dilute the manure. ### Step 6: Record the Event Record the date, which sections you drained, estimated volume, and storage level. This helps you track manure production and storage capacity over time. ## Step-by-Step Guide to Operating a Flush System Flush systems require more daily attention than other systems, but the routine is straightforward. ### Step 1: Check Flush Tanks and Valves Check flush tanks daily. Confirm that the water level is correct and that the valve opens and closes fully. A valve that sticks open wastes water. A valve that sticks closed leaves manure in the gutter. ### Step 2: Verify the Flush Schedule Most flush systems operate on timers. Confirm that the timer is set for the correct interval and that it is actually triggering the flush. If you have multiple gutters, verify that each one flushes on schedule. ### Step 3: Inspect the Gutters Walk the gutters after each flush to confirm that manure was removed. Look for solids that did not move, areas where the floor is dirty, and any debris that could block future flushes. ### Step 4: Check the Collection and Transfer System Inspect the collection channel, sump, and transfer pump or gravity line. Remove any solids that have settled. Confirm that the transfer system is moving manure to the storage structure as designed. ### Step 5: Monitor Storage Level Check the lagoon or storage structure level at least weekly. Flush systems produce large volumes of liquid, so storage fills faster than you might expect. Plan for pumping or irrigation well before the storage reaches capacity. ### Step 6: Adjust for Weather In cold weather, check for freezing in pipes, pumps, and valves. Insulate exposed components and keep a heat source near critical parts if needed. In hot weather, watch for increased fly pressure and adjust your fly control program accordingly. ### Step 7: Record the Event Keep a daily log of flush operations, water use, and any problems. This record helps you spot trends and identify equipment that needs service. ## Step-by-Step Guide to Operating a Scraper System Scraper systems need a different daily routine focused on mechanical inspection. ### Step 1: Check the Scraper Path Walk the full length of the scraper path daily. Look for debris, dead pigs, or other obstructions that could stop the scraper or cause it to jam. ### Step 2: Inspect the Scraper Blades Check the scraper blades for wear and damage. Worn blades do not clean the floor effectively. Replace blades when they show significant wear, typically every 6 to 12 months depending on use. ### Step 3: Verify the Drive System Check the motor, gearbox, cable, or chain for proper operation. Listen for unusual noises that could indicate a problem. Confirm that the scraper is moving at the correct speed and covering the full path. ### Step 4: Inspect the Collection Point Check the cross channel or collection pit where manure accumulates. Confirm that the transfer pump or gravity flow is moving manure to storage. Remove any solids that have settled in the collection point. ### Step 5: Monitor Gas Levels Even though scrapers keep the pit relatively empty, gas can still accumulate in the collection pit and transfer lines. Monitor gas levels regularly, especially before entering the pit area. ### Step 6: Record the Event Keep a maintenance log for the scraper system. Record blade replacements, drive system service, and any repairs. This log helps you predict when parts will need replacement. ## Ventilation and Gas Safety for All Systems No matter which manure removal system you use, gas safety is critical. Manure produces four main gases that can harm pigs and people. ### Hydrogen Sulfide Hydrogen sulfide has a rotten egg smell at low concentrations, but at higher concentrations it deadens your sense of smell, so you cannot rely on odor to warn you. It is heavier than air, so it collects in low areas. At concentrations above 100 parts per million, it can be immediately dangerous to life and health. Agitation releases large amounts of hydrogen sulfide, so pumping time is the most dangerous period. ### Methane Methane is produced by anaerobic decomposition of manure. It is flammable and can explode if it accumulates in an enclosed space. Methane is lighter than air, so it collects near the ceiling. Good ventilation prevents dangerous accumulation. ### Ammonia Ammonia is produced from the breakdown of urea in urine. It has a sharp, pungent smell and irritates the eyes and respiratory tract. High ammonia levels reduce pig performance and can cause respiratory disease. Ammonia is lighter than air and tends to accumulate near the ceiling. ### Carbon Dioxide Carbon dioxide is produced by both pigs and decomposing manure. At high concentrations, it displaces oxygen and can cause suffocation. It is heavier than air and collects in low areas. ### Ventilation Requirements Run ventilation continuously, even in cold weather. The minimum ventilation rate must be high enough to remove gases and moisture while maintaining adequate temperature. In cold weather, you may need to heat incoming air to maintain temperature while still ventilating. Use a ventilation controller that adjusts fan speed and inlet openings based on temperature and humidity. Set alarms to warn you if ventilation fails or if gas levels rise above safe thresholds. ### Gas Monitoring Install fixed gas monitors in the barn, especially in the pit area and near the ceiling. Calibrate monitors according to the manufacturer's instructions, typically every 3 to 6 months. Use portable gas monitors when entering pits, storage structures, or other confined spaces. Set alarms at the following levels: - Hydrogen sulfide: 10 parts per million - Ammonia: 25 parts per million - Methane: 20 percent of the lower explosive limit - Carbon dioxide: 5,000 parts per million If an alarm sounds, evacuate the barn and ventilate before re-entering. ### Confined Space Entry Never enter a manure pit, storage structure, or other confined space without proper training and equipment. Confined spaces kill people every year. The atmosphere can be fatal within seconds of entry. Follow these rules: - Test the atmosphere with a calibrated monitor before entry. - Use a harness and lifeline attached to a person outside the space. - Have a second person outside who can call for help. - Use forced ventilation to keep the air safe. - Never enter to rescue someone without proper equipment. Call emergency services instead. ## Common Mistakes and How to Avoid Them Producers make several recurring mistakes with manure removal systems. Learn from these examples. ### Waiting Too Long to Pump a Deep Pit A full pit is dangerous and hard to manage. As the pit fills, gas production increases and the manure becomes harder to agitate. Pump before the pit reaches 90 percent full. If you consistently run out of storage capacity, consider expanding your storage or changing your application schedule. ### Agitating Too Long Before Pumping Long agitation releases large amounts of gas into the barn. Keep agitation time to 30 minutes or less before starting the pump. If you need more agitation to suspend solids, do it in short bursts while the pump runs. ### Ignoring Ventilation Alarms Ventilation alarms save lives. If an alarm sounds, do not ignore it. Check the barn immediately and fix the problem. A few hours of poor ventilation can harm pigs and create dangerous conditions for workers. ### Flushing with Too Much Water Excessive flush water increases your storage volume and dilutes the nutrient value of the manure. Use the minimum water volume that effectively removes manure. Adjust flush volume based on pig size and number. Large pigs produce more manure than small pigs, so you may need to increase flush volume as pigs grow. ### Letting Scraper Maintenance Slide Scrapers need regular attention. A broken scraper quickly leads to manure buildup and gas problems. Inspect scrapers daily and service them on a regular schedule. Keep spare blades, cables, and sensors on hand. ### Failing to Keep Records Records help you manage your system and prove compliance with regulations. Keep a log of pump-outs, flush operations, scraper maintenance, gas monitoring results, and manure nutrient tests. Review the log monthly to spot trends and problems. ### Not Testing Manure Nutrients Manure nutrient content varies by system, diet, and storage time. Test your manure regularly so you can apply the right amount of nutrients to your crops. Work with your crop advisor or extension agent to develop a sampling plan. ## Decision Thresholds: When to Change Your System You may need to change your manure removal system if you experience persistent problems. Consider these decision thresholds. ### Gas Problems If you have repeated gas alarms, pig health problems, or worker symptoms such as headaches or nausea, your ventilation or manure removal is not working well. First, check ventilation settings and equipment. If ventilation is adequate, consider whether your manure removal system is allowing too much gas to accumulate. A deep pit that is too full, a flush system with stuck valves, or a scraper that is not running often enough can all cause gas problems. ### Water Shortage If your water supply is declining or your water use is restricted, a flush system may no longer be viable. Consider converting to a pull plug or scraper system that uses little or no water. ### Storage Capacity If you consistently run out of storage capacity, you have three options: expand storage, pump more often, or change to a system that produces less liquid. Deep pit and scraper systems produce the most concentrated manure, so they require the least storage volume per pound of nutrient. ### Labor Constraints If you cannot keep up with the daily demands of a flush or scraper system, consider a deep pit or pull plug system. These systems require less daily attention, though they need more intensive management during pump-out. ### Regulatory Pressure If local regulations change regarding water use, lagoon construction, or manure application, your current system may become noncompliant. Check with your regulatory agency regularly and plan for changes. ## Monitoring and Recordkeeping Good monitoring and recordkeeping protect your pigs, your workers, and your operation. ### What to Monitor Monitor the following items on a regular schedule: - Pit or storage level - Gas concentrations in the barn and pit - Ventilation operation and alarms - Flush timer and valve function - Scraper operation and blade condition - Transfer pump operation - Manure temperature and odor - Fly pressure - Pig behavior and health ### What to Record Keep records of the following items: - Pump-out dates, volumes, and application fields - Flush schedules and water use - Scraper maintenance and repairs - Gas monitoring results - Ventilation maintenance - Manure nutrient test results - Storage levels - Any problems or unusual events ### How to Use Records Review your records monthly. Look for trends such as increasing water use, declining scraper performance, or rising gas levels. Address problems before they become serious. Use your records to plan future pump-outs and maintenance. ## When to Call a Veterinarian or Extension Agent Most manure removal problems are mechanical or management issues you can solve yourself. However, some situations call for professional help. ### Call Your Veterinarian If - Pigs show respiratory distress, coughing, or reduced feed intake that may be related to air quality. - You see a sudden increase in death loss with no obvious cause. - Pigs show signs of ammonia toxicity, such as eye irritation, nasal discharge, or labored breathing. - You suspect a disease outbreak that may be worsened by poor air quality. ### Call Your Extension Agent If - You are designing a new barn or retrofitting an existing barn and need help selecting a manure removal system. - You have questions about nutrient management planning or manure application rates. - You need help interpreting manure nutrient test results. - You are considering a major change to your manure handling system. - You have questions about local regulations or best management practices. ### Call Your Regulatory Agency If - You have a manure spill or discharge. - You are planning to expand or modify your storage structures. - You receive a complaint about odor or water quality. ## Frequently Asked Questions ### How often should I pump a deep pit in a grow-finish barn? Most producers pump deep pits once or twice a year, typically in spring and fall. The exact interval depends on pit depth, pig numbers, and how long pigs are in the barn. Monitor pit level weekly and pump when the pit reaches 80 to 90 percent full. Some operations with very large pits can go 18 months or longer between pump-outs, but this is uncommon. ### What is the difference between a pull plug system and a deep pit? A deep pit stores manure under the barn for months at a time. A pull plug system uses a shallow pit that drains on a schedule, usually every 7 to 14 days, to an outside storage structure. Pull plug systems reduce in-barn gas production compared to deep pits, but they require outside storage capacity. ### Can I convert my deep pit barn to a flush system? Converting a deep pit to a flush system is difficult and expensive. You would need to modify the pit floor to create gutters, install flush tanks and valves, and add a collection and transfer system. In most cases, it is more economical to build a new flush barn or keep the deep pit and manage it well. ### How much water does a flush system use? Water use varies widely by system design. Some flush systems use as little as 10 to 20 gallons per flush per gutter, while others use 100 gallons or more. A barn with 10 gutters flushed twice daily could use 200 to 2,000 gallons per day. Using recycled lagoon effluent can reduce fresh water demand substantially. ### Do scraper systems work in cold climates? Yes, scraper systems work in cold climates, but you need to protect the collection pit, transfer lines, and any pumps from freezing. Insulate exposed pipes and consider placing the collection pit inside the barn or in a heated area. Some producers add heat tape or heat lamps to critical components. ### What is the safest way to agitate a deep pit before pumping? Start the pump before you begin agitating. Break up the crust gradually, working in sections. Keep agitation time under 30 minutes before pumping starts. Run ventilation at maximum capacity. Keep people and animals out of the barn during agitation and pumping. Monitor gas levels continuously and stop work if alarms sound. ### How do I know if my ventilation is adequate for my manure removal system? Monitor gas levels regularly with calibrated equipment. Set alarms for hydrogen sulfide, ammonia, methane, and carbon dioxide. Watch pig behavior for signs of respiratory distress. If gas levels are consistently above safe thresholds, increase ventilation or address the manure removal problem. Work with your extension agent or a ventilation specialist to evaluate your system. ### Should I test my manure for nutrient content? Yes, test your manure regularly, at least once per year and preferably at each pump-out. Manure nutrient content varies by system, diet, and storage time. Testing ensures you apply the right amount of nutrients to your crops and avoid overapplication. Your extension agent can help you take representative samples and interpret results. ## Related Farming Guides This section will be populated with links to related farming guides on swine barn management, pig health, ventilation systems, and nutrient management planning. ## Related Clinical & Scientific Guides * [Pig Enrichment Programs and Behavior Monitoring](/knowledge/animal-farming/swine/pig-enrichment-programs-and-behavior-monitoring) * [Swine Handling Facility Design for Safe Pig Movement](/knowledge/animal-farming/swine/swine-handling-facility-design-safe-pig-movement) * [Swine Feeding Management for Grow-Finish Pigs](/knowledge/animal-farming/swine/swine-feeding-management-for-grow-finish-pigs) ## References - National Pork Board: https://www.pork.org/ - USDA APHIS Swine Health: https://www.aphis.usda.gov/livestock-poultry-disease/swine - FAO Pig Production: https://www.fao.org/pig-production-and-products/en/ - FAO Animal Production and Health: https://www.fao.org/animal-production/en/ - WOAH (World Organisation for Animal Health): https://www.woah.org/en/home/ > This article is educational and is not a substitute for veterinary diagnosis, treatment, public-health guidance, or regulatory reporting.