FAQs & Reference
EasyFit | Which Pool Pump do I Need?
5 (Mostly) Easy Steps
Here are 5 easy steps to find the perfect performance EasyFit pump for your pool:
1. Calculate Pool Volume (in Gallons)
- To calculate the pool volume you need to consider the shape of the pool. To save you doing all the math, here is a simple calculator: Pool Volume Calculator
2. Determine Pool Turnover Rate (Min 2/Day)
- The turnover rate is the amount of time it takes for the pump & filtration system to cycle all of the water in a swimming pool.
- The minimum recommended turnover rate for residential swimming pools is 12 hours. High usage may require turnover rates of 10 hours or 8 hours.
- We suggest using either 12 or 8 hours for your calculates as they translate into 2 or 3 turnovers per 24 hour day so the math is easier.
3. Calculate the Flow Rate (Gallons/Min)
- If your pool size is 20ft x 40ft, and 6ft deep, your pool volume would be 4800ft3, which is equal to 35,904 gallons (Gallons = ft3 x 7.48).
- Assuming normal use – and thus a turnover rate of 12 hours – the turnover rate would be 35,904 gal / 12h or 2,992 gal/h.
- To convert gal/h to gal/min (gpm), you divide by 60. So 2,992 gal/h = 49.9 GPM.
- Your pool pump should, therefore, handle a flow rate of at least 50 GPM.
4. Calculate the Total Dynamic Head (TDH)
- This calculation is rather complicated. The total dynamic head is calculated by adding the elevation distance between the water line and the pump (Hz), plus additional head loss due to pressure and frictional loss in the pipework and resistance in other equipment (Hf). Htotal = Hz + Hf
- While many useful TDH calculators for swimming pools can be found online, as a rule of thumb you can assume the TDH is 40ft, as we will for this example.
5. Determine the Needed Pump Operating Point
- Each pump has its own performance curve (pump characteristic) which is a graph showing the pump flow rate (GPM) vs. the total dynamic head (ft).
- Using the flow rate and TDH calculated in the previous steps, select a pump whose performance curve either crosses your point or lies just above it.
- The pump performance curve should not fall below your required performance point.
- Here are the performance curves for EasyFit single and 2-speed pumps (top chart) and variable pumps (bottom chart). Or download the PDF for a more detailed view of the EasyFit pump specs here: EasyFit Pump - One Sheet - Product Specs
EasyFit | Single and 2 Speed Pump Performance Curve
EasyFit | Variable Pump Performance Curve
- So in our example: we look across to find 50 gallons/min (GPM) and up to find 40 TDP, and we'll see that ALL of our EasyFit Series pump curves are ABOVE this performance point, so any of our series will perform well enough for this pool!
- So how do you decide which pump to buy now? Well read the next section (on the right side this page) to see which features fit your personal preferences, needs and budget. That will determine the best pump for you!
EasyFit | How to Choose Pump Options
5 Key FeaturesThere are 5 key features of a pump, some are pre-determined by your existing installation, while others you can choose as to your preference. Here we explain each:
Options | Pre-Determined By Your Setup
1. The Brand of your current pump you want to replace
EasyFit SUP Series
EasyFit replacement for Pentair SuperFlo and Hayward Super Pump
EasyFit PNT Series
EasyFit replacement for Pentair WhisperFlo and Intelliflo pool pumps
EasyFit MXG Series
EasyFit replacement for Sta-Rite Dura-Glas and Max-E-Glas pool pumps
EasyFit DYN Series
EasyFit replacement for Sta-Rite Dyna-Glas pool pumps
EasyFit SPK Series
EasyFit universal replacement pump
2. Do you have Residential (1 phase) or Commercial (3 phase) electricity
3. What is the Voltage of your power grid
- 115 V (Same as 120V; Standard wall plug-in USA)
- 230 V (High voltage for appliances; Offered in USA)
- 208-230 V (High voltage option range; Offered in USA)
- 208-230 V (Can be used Internationally)
- 460 V (Used for Commercial 3 Phase systems only)
Options | Your Preference
4. Select Total HP you'd preferThe minimum Total Horse Power (THP) of your pump will depend on the size of your pool (see calculation on left side of this page) and/or the size of pump you're replacing.
5. Select Standard or Premium Energy Efficiency
Energy Efficiency is achieved by using the pump at different speeds for different functions. So to achieve efficiency, there are two features to choose:
Choice of Motor and SpeedThe EasyFit is available with the following motors:
Single (Only 1 Speed)
The single speed motor is not considered Energy Efficient, as it runs at the same speed no matter what the task.
Two-Speed (High and Low)
The Two-Speed is slightly more efficient as it can run on low for filtration and high for cleaning.
Variable Speed (Multiple Speeds)
The Variable Speed is the most efficient as it can be more precisely tuned to the desired power for any task
This means for the Two-Speed, that you have to manually turn it to "Low" for filtration and "High" when cleaning. This can be a tedious and time-consuming process. So the best and most convenient way to achieve the top energy efficiency is to set a Digital Timer for the hours of the day when you want the pump to run "Low" or "High".
Rule of Thumb: If you're a residential customer in the USA, with an average size pool, our EasyFit Series II or III, 2-Speed pumps with Digital Timer are probably the best option for you.