That’s the rate at which you’d want the filter to work. Total Pool Volume ÷ 8 = GPH. Now that we have gallons per minute (GPM) and pool volume, we can calculate the run time. Filters have a designed flow rate. The result is pump stress, operating noise, and significantly higher energy costs. Pump Equations Formulas Calculator Fluid Mechanics and Hydraulics. The pool filtration flow rate shall not be greater than the rate needed to turn over the pool water volume in 6 hours or 36 gpm whichever is greater. Swimming pool pump and filter calculator solving for pump flow rate given pool volume and turnover rate or time. For each 1.5 inch intake line, the maximum flow into the pump will be 42 gallons per minute (GPM). Required Flow Rate: in GPM Max System Pressure Required: in psi Fill in required flow and pressure from the pump to determine pump input horsepower required. Kent County Health Department and Michigan State University. FIGURE C* FIGURE E* FRICTION HEAD IN FEET PER 100’ OF SCHEDULE 40 PLASTIC PIPE 1¼” 1½” 2” GPM Plastic Plastic Plastic 10 1.45 0.68 0.20 calculating gpm from rpm. Instead of running your pump only a few hours per day every variable speed pool pump owner should instead run their pump 24 hours per day. The pool turnover rate is important for proper filtration. Depending upon the pool's size, floating solar filter systems may accommodate the swimming pool's needs. If the flow rate is incorrect, it will damage piping and equipment, cause filtration problems, and create an unsafe swimming environment. Solar pool pumps have a chart to determine the best pool pump to use for your pool. Each pool filter media has its own unique advantages and disadvantages. At Pentair, we believe the health of our … For this example, let's say you have a 20,000 gallon pool and the pool pump has a GPM rating of 40. Not cycling enough water through the filter can result in swimming pool algae blooms, cloudy pool water and water balance issues. Also, take a look at this PDF file for an actual commercial pool installation with a 215,000 gallon pool with a 15 HP pump that delivers 582 GPM at a Total Dynamic Head of 68 feet. Many pool builders routinely sell against their competition by quoting a "bigger" pump as a "free upgrade." Note: The information provided here is intended as a guide in helping customers determine which size pump will be suitable for an existing swimming pool. High flow rates also cause unsafe levels of force generated by the drains, which could lead to a swimmer or objects becoming entrap by the drain. Flow rate is impacted by a number of variables like the dynamic head loss, clogged skimmers, clogged filters or addition of equipment like cleaners, heaters and sanitization equipment that add to the dynamic head. Heads up: your plumbing setup may be different across your entire pool environment. The typical two-a-day segments are: 6 hour cycles, 8 hour cycles, and 10 hour cycles. For both traditional chlorine pools and saltwater pools, the industry standard is 2 turnovers per day. When the flow rate is too low, it causes a poor distribution of disinfectant throughout the pool. Make sure the the lines going back to the pool will also support the same level of flow. The flow rate will determine the turnover rate, which is the amount of time it takes the pump and filter to circulate the volume of water in the pool. Pool Volume in Gallons ÷ Turnover Rate in Minutes = Flow Rate. That’s the rate at which you’d want the filter to work. Los Angeles County requires pumps to deliver the desired gallons per minute at 60 feet of head. Use the total feet of head and the desired flow rate to determine the horsepower for your pool's make and model. Running at low horsepower for longer periods of time results in a more balanced water chemistry, but can be a sink on your electricity bill. The math is simple. 1. 3 or No. There you have it! Enter the total horizontal pipe length (feet) for your system. Pool pumps produce different flow rates at varying levels of resistance. Enter flowrate delivered by the pump (gallons per minute). Pool Chemical Calculator - Simple Pool Calculators For Easy Pool Management, A Chlorine Free Water Treatment For Pools. Your 25,000-gallon pool needs an output of 52 gallons per minute to circulate the water once every eight hours. Turn on the pump and a stopwatch at the same time. 2) Pump must be capable of providing the minimum required GPM for pipe size, Figure “C”, at the calculated TDH #10 . DE filters are a little rangy as well. Okay, we now have everything we need! Pool Chemical Calculator suite is for educational purposes only. Pool pump flow charts, or performance charts, list Resistance … Hayward's easy-to-use Energy Solutions Calculator computes your estimated savings by switching to the Hayward family of variable speed pumps. The flow rate will determine the turnover rate, which is the amount of time it takes the pump and filter to circulate the volume of water in the pool. Enter information into any 3 of the following 4 fields and press calculate. Industry standards recommend a minimum target turnover rate of 6 hours and a minimum of 2 turnovers per 24 hours. Check with the manufacturer for specific flow rate requirements. It's important to size a pool pump based on your pool specs. As a result, the vast majority of pools have pumps that are severely oversized. Page 15 Note: If the flow rate (GPM) changes from the initial calculation… Now that we have filters settled, let’s move on to maximum flow rates for plumbing. If not, you can use these common values or ask your contractor. Be sure to check out our recommendations for the best single and variable speed pumps as well. Whether you need a remodel, a new pool, or just some maintenance help, HomeAdvisor will find the best professional for the job. 4 in the following calculations for the pool & Spa) DeterminePipe(Sizes:(Branch Piping to be _____ inch to keep velocity @ 6 fps max. Example: We want turnover in our 25,000 gallon pool to be 6 hours (6 hours) x (60) = 360 minutes (25,000 gallons)/(360) = 69 GPM So we should have approximately 70 gallons going through the pump… Let’s also say that you have a 2.3 square foot sand filter (50 GPM max) and 1.5″ plumbing (43 GPM). The primary function of the filter is to clear the water of dirt, debris, small particles and more. The steps outlined below will allow you to roughly gauge which Hayward pump is most suitable for your pool. An undersized filter can lead to numerous problems, including cloudy pool water, increased chemical demands, pH swings, and unsafe swimming pool water. Pool Pump Selection Guide . Below, we’ll run through how to easily figure it out step-by-step and choose your pool pump confidently. Pool Pump Selection Guide . We first need to determine how many gallons of water are in your pool. To best match a pool pump size to the pool filter’s design flow rate, the pool pump feet of head must be known, or at least approximated. Make sure you stay below the maximum flow rates for your filter system or you could end up damaging it. ... We have a 21,000 gallon pool and I'm running the pump at 2000 RPMs for 7 hours a day and at 3450 RPMs for 3 hours a day while the Polaris cleaner runs. We’ll start with filters. Spa Turnover Rates Natural Current has been in the Pool Industry since 1986 and with hard work and dedication, we now have thousands of pool owners off the grid with their pool pumps. The filter, pump, pipes, heater, backwash valve, return, and other accessories have an effect on how water flows throughout your system. We work hard every day to make sure you're not the first. Evaluate your pool and find out the correct pump size for your pool. From a desk and a telephone in a walk-in closet, we have grown into over 6,000 square feet of space, eleven employees and five service vehicles in … So, let’s calculate the minimum flow rate we need for all four of these options. Stating this situation another way; the calculations for your 29,920-gallon pool show that you require a flow rate of 62.3 gpm to filter the pool’s capacity in eight hours. Example: The input horsepower required for a pump that needs to provide 10 GPM at 2000 psi is: HP= (10 x … GPH ÷ 60 = GPM. There are three types of pool filters (sand, cartridge, and DE) and all of them have different maximum flow rates based on their surface area. Up to 76% of pool pumps were built with pumps that are too large relative to the pipe diameter. This is where variable speed pool pumps come in handy – they can speed up and slow down when you need them to, resulting in a much safer pool chemistry and energy efficient setup, which is a nice savings on that electric bill. The pump pushes the water through the filter, cleaning the water and dispersing the chemicals evenly throughout the pool. Pumps, on the other hand, use a slightly different description of "gallons per minute" or GPM. Adjust sliders to calculate pool total flow rate. Save operating notes, warranty details and manufacturer support info for each piece of equipment. Cartridge filters are a lot bigger and a little less exact. Pool pump flow charts, or performance charts, list Resistance … Disp = Pump Displacement in Cubic Inches . Plan for approximately 1.75 GPM per square foot of surface area, assuming the middle of the ranges below. To calculate the flow rate per minute in this case: 3,740 ÷ 60 = 62.3. You can choose to run your pump 24 hours per day (decreasing your GPM needs) or twice a day in different segments. Enter any misc. For example, the pipes leading to your spa could differ from the main pool area. Spa Jets normally require 10-15 GPM. Use our pool volume calculator below and then we’ll start calculating the minimum flow rate you need for your pump. Pump Sizing does the hydraulic calculation for a centrifugal pump and estimates differential head, hydraulic power, motor power, NPSH available. The turnover rate for the pool may not be as large as the spa jet requirement. Pool Pump Savings Calculator DOE Pump Regulations NEW DEPARTMENT OF ENERGY POOL PUMP REGULATIONS. a bigger pump, often it is easier to change the pipe or tube than to change the pump. Pool pumps produce different flow rates at varying levels of resistance. The math is simple. The maximum flow rate of your plumbing setup depends on the pipe size and should be clearly labeled on your system. In our inground pool example, we need a pool pump with a 20.8-43 GPM flow rate range and 50 TDH (also called Feet of Head). Aquatic Environmental Systems was founded in 1983 to be a resource for swimming pool and water treatment professionals in the Southwest. This calculation is based on the existing (measured) or designed pool(s) area and pool(s) depth.The calculated value is provided in US Gallons, cubic feet, liters and cubic meters.You may find this information quite practical as in your region (i.e. Usually, temperature correction for water is negligible. A flow rate that is unable to achieve proper turnover time can result in cloudy pool water, algae blooms, higher chemical demands and potentially dangerous pool water. Pumps are responsible for water circulation in all swimming pools. GPM = Gallons Per Minute. When sizing pumps, you must assume at least 60 feet of head regardless of the actual calculations. To learn how to calculate the water horsepower for a specific project, read on! The rate of flow of water in a pool is an essential calculation for a pool owner when it comes to purchasing or replacing pool equipment. Not one customer has ever called and said get this solar pump off my pool. Pressure = Pounds per Square Inch . Once you have the approximate number of gallons of water in your pool, we have to figure our minimum flow rate for the pump, using a Gallons Per Minute (GPM) calculation. This will help us figure out how much water needs to be circulated in an 8 hour period and give us an idea of the required turnover rate. Generally speaking, the greater the hp, the greater the force for pushing water. GPM takes into account your pool size and the number of “turnovers” you need per day (your turnover rate). Okay, let’s move on to the next part of our pool pump sizing – figuring out your maximum flow rate. To best match a pool pump size to the pool filter’s design flow rate, the pool pump feet of head must be known, or at least approximated. For this example, let's say you have a 20,000 gallon pool and the pool pump has a GPM rating of 40. Flow rate is impacted by a number of variables like the dynamic head loss, clogged skimmers, clogged filters or addition of equipment like cleaners, heaters and sanitization equipment that add to the dynamic head. Solving For Water Horsepower. The result is pump stress, operating noise, and significantly higher energy costs. Once the pump is working, measure how many gallons per minute are being pumped and estimate the horsepower based on these values. Shoot us a message and we’ll be happy to help. Pool Pump Sizing How to correctly size a pool pump for your swimming pool. at _____ gpm Maximum System Flow Rate To find the input horsepower requirement for a hydraulic pump, use this hydraulic pump horsepower formula: HP = (Flow x Pressure) / 1714. 3) Pump’s lock valve must be greater than system’s highest point. TDH Calculator Calculate the Total Dynamic Head (TDH) for a piping system. Use Table 3.5 (Step #1) to determine number of fixture units Then use Table 3.6 (Step #2) to convert Fixture Units to GPM Enter the GPM in the GPM box under "Design Flow Rate" on the Pump … Rectangular pool = length (ft) x width x average depth x 7.48 2. If so, what is the auxiliary flow rate _____gpm Maximum Flow Rate _____gpm (maximum auxiliary pool loads or the filtration flow rate, whichever is greater. Adequate filtration is the primary source of clean clear pool water. Otherwise, you could risk damaging the setup for part of your pool environment. 300 square feet surface area = 80-112 GPM, 400 square feet surface area = 100-150 GPM. There are a few primary factors that go into finding the right size pool pump. Calculated out this gives an output flow of 23.81GPM (rounded to … If the pool is 100,000 then the flow rate might be 100000/6/60 = 278 GPM or thereabouts. This calculation differs based on pool shape, but is pretty straightforward. How to Select an Inground Pool Pump - http://bit.ly/36gSIy1How Do I Calculate Feet of Head for My Pool? To calculate the flow rate per minute in this case: 3,740 ÷ 60 = 62.3. First up, you need to figure out how many gallons of water are in your swimming pool. Calculated out this gives an output flow of 23.81GPM (rounded to … I recently purchased a home with a perimeter overflow pool. The most important factor of the size of the Swimming Pool Filter is the GPM your Pool Pump produces. Does anyone have a good method for figuring out the gallons per minute flow based on revolutions per minute on a Pentair 4 160 pump. Since we always go for the higher GPM, we would select the 1 HP pump. Flow Rate is the measurement of gallons per minute (GPM) of water flowing through the circulation system at a given period of time. From a desk and a telephone in a walk-in closet, we have grown into over 6,000 square feet of space, eleven employees and five service vehicles in … Pool Pump Size Calculator: What Size Pump Do You Need? Flow = Gallons Per Minute. Track and chart chemical test history for multiple pools. See how much you can save with our other pool product calcutors. Aquatic Environmental Systems was founded in 1983 to be a resource for swimming pool and water treatment professionals in the Southwest. View All Calculators From residential and business solutions that help people move, improve and enjoy their water, to our sustainable industrial applications, Pentair makes the most of life's essential resources. All pool pump models will have charts with horsepower estimates based on flow rate ranges and total dynamic head. Let’s do some math! Say good bye to chlorine. Fountain / Waterfall Pump Selector Calculator-- Use this tool will recommend the correct easy pro pond or fountain pump for your application.To find the pump, look at the chart, under the column titled "pump" enter the model number of the pump in the search box located on our page's main menu to the left. 3450 RPM) it is pumping 174 GPM… The ultimate goal is efficiency here – balancing electricity bill savings with pump horsepower and balanced water chemistry. Pool water circulation is important for proper filtration. The data sheet and owners manual do not provide much information other than to say that on max RPM (i.e. This is because pumps are a lot more efficient than they used to be and you run the risk of oversizing the pump if you simply go by horsepower ratings. We are proud to say with zero returns! The rate of flow of water in a pool is an essential calculation for a pool owner when it comes to purchasing or replacing pool equipment. Enter total pumping lift or height (feet) water is pumped vertically. Swimming pool pump and filter calculator solving for pump flow rate given pool volume and turnover rate or time. Questions? Grab that calculator and just “sub-in” your measurements for these: Pool pumps run from 1/2- to 2 1/2-hp. ... Flow rates are proportional to the RPM of the pump. Let’s do some math! The pump must be the right size for your pool so that the filtering system operates efficiently. Also, the water doesn’t get the recommended number of turnovers allowing breakouts of fungus, algae, viral and bacterial in the dead zones. Most pool equipment depends on a minimum flow rate to function properly. With the desired flow rate of 47.75 GPM and 28.75 feet of resistance, the example above will need at least a one horsepower pool pump to circulate correctly. They are: Single-speed pumps. In this example, our flow rate range comes out to 20.8-43 GPM. This tool calculates the savings a commercial pool operator will realize when switching from a standard pool pump to the IntelliFlo® Variable Speed Pump. But before you run off to the store, let’s talk about a couple of other considerations you should think about. How Much Pump Do I Need? Inputs: discharge or flow rate (Q) High flow rate can affect the performance of sand filters by causing channeling within the sand bed of the filter. Effective July 19, 2021, new U.S. Department of Energy (DOE) regulations will go into effect that require Dedicated Purpose Pool Pumps (DP3) manufactured in or imported into the U.S. meet minimum energy-efficiency standards. It is completely dependent on your plumbing system and other pool equipment, all of which should have documentation on maximum flow rates. GPH ÷ 60 = GPM. Almost there! Always remember to take the lowest of the maximum flow rates for sizing up your pool pump. Sump/Sewage/Grinder GPM Calculation Worksheet Use the tables below to calculate GPM required. 60 gpm in 2-inch pipe = 5.7 feet per second By the way, there are a few exceptions to the rules. Total dynamic head is a resistance metric – it tells you the total amount of resistance in the hydraulic system of your pool. In the example above we were using the Hayward Super pump that produces a 58 GPM at 30 feet of Head. Note: The information provided here is intended as a guide in helping customers determine which size pump will be suitable for an existing swimming pool. Fortunately, you don’t have to do a bunch of fancy math to figure our maximum flow rate. If the spa requires more than 20% of the pool turnover rate, a two pump system should be considered. For our solar pool project, we wanted to calculate the Gallons Per Minute (GPM) Flow Rate that our 12 Volt pump was producing. Hydraulic Pump Horsepower Calculator. It is important not to choose a pool pump larger than needed. The result is a properly sized pump that … Below is a list of benefits associated with moving the water slower (reducing GPM flow rate). Grab that calculator and just “sub-in” your measurements for these: All good? The opposite is true for higher horsepower and shorter run times. This centrifugal pump power calculator is meant to quickly calculate mechanical power required for a specific set point. This turnover is required every 12 hours, or twice a day. Pool pumps circulate water through the pool filtering system, mixing chemicals and sanitizing the water to help keep it clean. As a general rule of thumb, sand filters typically fall between 19-22 Max GPM per square foot of surface area. Before we get into the calculation, you have a few options here. (For Single Pump pool/spa combo, use the higher of No. You’ve done the hard part, all the calculations to determine exactly what size pool pump will filter your pool’s water in a day. If your pool volume is 15,000 gallons, then one turnover would be equal to 15,000 gallons. Use Table 3.5 (Step #1) to determine number of fixture units Then use Table 3.6 (Step #2) to convert Fixture Units to GPM Enter the GPM in the GPM box under "Design Flow Rate" on the Pump … How to Select an Inground Pool Pump - http://bit.ly/36gSIy1How Do I Calculate Feet of Head for My Pool? Now that we have gallons per minute (GPM) and pool volume, we can calculate the run time. We work with HomeAdvisor to match you with the best swimming pool contractors in your area. Total Pool Volume ÷ 8 = GPH. Pool water flow rate is an important factor for determining turn over rate and ensuring the pool water is receiving adequate filtration. Michael has over 25 years of experience in the swimming pool industry. Example: We want turnover in our 25,000 gallon pool to be 6 hours (6 hours) x (60) = 360 minutes (25,000 gallons)/(360) = 69 GPM So we should have approximately 70 gallons going through the pump… Most inground pools will be somewhere around 50 TDH. When purchasing a new filter, the maximum flow rate of your system should not exceed the new filters capacity. Stating this situation another way; the calculations for your 29,920-gallon pool show that you require a flow rate of 62.3 gpm to filter the pool’s capacity in eight hours. Typically, you’re going to average 0.3 to 0.35 GPM per square foot of surface area. Hayward's easy-to-use Energy Solutions Calculator computes your estimated savings by switching to the Hayward family of variable speed pumps. Example: The output flow of a pump spinning at a rate of 2000rpm with a displacement of 2.75 cubic inches: Flow (GPM) = (2000 x 2.75) / 231. Oxygen Pools is the first true chlorine free solution for above ground pools. For example, you have three speed choices for your pump. Note: Equation for water at 68 Fahrenheit. After the head loss has been calculated in feet, check the manufacturer's charts to see what pool pump will work best for the particular setup. Now that we have the minimum and maximum flow rates for your pool setup, put them together to get to your flow rate range: one of the two main specs for determining the pool pump size you need. Pentair delivers smart, sustainable solutions that empower our customers to make the most of life's essential resource. Verifying the correct flow rate for the swimming pool is an important pivotal role in properly filtering and disinfecting the pool water. Oval pool = ½ length (ft) x ½ width x average depth x 3.14 x 7.48 3. ... Haan, William D. and Johanningsmeier, Julie S. Swimming Pool Pest Management: A Training Manual for Commercial Pesticide Applicators and Swimming Pool Operators. at _____ gpm Maximum System Flow Rate Suction Piping to be _____ inch to keep velocity @ 8 fps max. For each 2.0 inch intake line, the maximum flow into the pump will be 73 gallons per minute (GPM). This calculator allows you to estimate the volume of water in your pool(s). The steps outlined below will allow you to roughly gauge which Hayward pump is most suitable for your pool. Okay, let’s move on to the next step. Let’s figure out the last main spec you need for your pool pump: total dynamic head. Water pumps of 1, 1.5, and 2 horsepower are very common -- and for the average size pool, very oversized. … All pool pump models will have charts with horsepower estimates based on flow rate ranges and total dynamic head. Pump Sizing does the hydraulic calculation for a centrifugal pump and estimates differential head, hydraulic power, motor power, NPSH available. Turnover rate requirements will vary by local health codes. You have to take the lower of those two values to make sure you don’t overwork any components of your pool, so your maximum flow rate comes to 43 GPM. For our solar pool project, we wanted to calculate the Gallons Per Minute (GPM) Flow Rate that our 12 Volt pump was producing. flow rate) and head in conjunction with the right pipe or tube size to get the flow rate you intend at the destination. Water circulation is the very first step for quality and clarity of pool water. Here are the flow rates for common filter types and sizes. Save pool equipment configuration. Pool water flow rate is an important factor for determining turn over rate and ensuring the pool water is receiving adequate filtration. He has built pools and natural landscapes for hundreds of homes and businesses across the country. Reducing the TDH that the pump must overcome allows us to utilize smaller horsepower pumps and/or operate pumps at lower speeds. We’ll go into more specifics on TDH in another post. This designed flow rate should be higher than the size of your GPM your pool pump produces. So, let’s say you have a 15,000 gallon inground pool. GPM = Gallons Per Minute. Disp = Pump Displacement in Cubic Inches . Pool Chemical Calculator is not responsible for any actions taken based on the results of these calculators. Select nominal pipe diameter (inches) using the pull-down menu. In practice, to get the optimal system you have to select the pump capacity (i.e. According to the chart for 50 Feet of Head (closest to 47'), we need a pump between 3/4 HP (31 GPM) and 1 HP (50 GPM). Each pool pump can handle various flow rates and head losses with different horsepowers. With two turnovers per day, your minimum flow rate comes to 20.8 GPM. It is important to carefully evaluate your pools needs before deciding on a replacement pump.. Above ground pools typically fall around 30 TDH. Evaluate your pool and find out the correct pump size for your pool. Pool Alkalinity Calculator: What to Add & How Much. Example: The output flow of a pump spinning at a rate of 2000rpm with a displacement of 2.75 cubic inches: Flow (GPM) = (2000 x 2.75) / 231. Based on the data calculated above for a typical RECTANGULAR pool, we are looking for a pump that will handle 42GPM with a 47 Feet of Head. Manufacturers recommended dosing amounts should always be followed when available. Up to 76% of pool pumps were built with pumps that are too large relative to the pipe diameter. Sump/Sewage/Grinder GPM Calculation Worksheet Use the tables below to calculate GPM required. If a pool is without a pump or a working filter there no way to remove contaminants, dirt and debris. With the desired flow rate of 47.75 GPM and 28.75 feet of resistanc e, the example above will need at least a one horsepower pool pump to circulate correctly. In our inground pool example, we need a pool pump with a 20.8-43 GPM flow rate range and 50 TDH (also called Feet of Head). The channeling will make the pool water cloudy by allowing dirty water to passed the filter media. The Flow Rate is crucial for the filter to work properly. Pool Salt Calculator: How Much Salt Do You Need to Add? Additionally, the Energy Solutions Calculator can show you how much MORE you can save by switching to a Hayward energy efficient filter, cleaner, heater or heat pump, control or lighting product. A strong pump is needed for a large pool or a condition where the pump must move water an unusual distance or height—such as up to second-story roof to circulate through a solar pool … Round pool = radius (ft) x radius x average depth x 3.14 x 7.48If you would like to use a calculator to d… You never want to put more pressure in your pipes than they can handle. I was using the Francis Formula to calculate the GPM of water that I need to push 1/16 inch of water over the edge. He also holds multiple patents for pool performance products he has engineered over the years. Fountain / Waterfall Pump Selector Calculator-- Use this tool will recommend the correct easy pro pond or fountain pump for your application.To find the pump, look at the chart, under the column titled "pump" enter the model number of the pump in the search box located on our page's main menu to the left. It is always recommended to oversize the pool filter. A pool without filtration is a breeding ground for bacteria, organisms, algae, making it dangerous for swimmers.