Pool pump and turnover calculator
Turnover is how long the pump takes to push the whole pool volume through the filter. Six to eight hours is the usual target.
hours
m3/h
m2
kW
per kWh
Flow rate needed
6.67m3/h
- Turnover with your pump
- 4.00 hours
- Daily run time for one turnover
- 4.00 hours
- Daily pump cost
- 0.840
- Annual pump cost
- 306.81
- Filtration rate
- 20.00 m3/h per m2
- Filter is not overloaded Sand filters should stay under about 37 m3/h per square metre.
- 1
- Turnovers in 24 hours
- 6.00
Show the working
- Pool volume = 40 000
- Target turnover = 6
- Pump flow rate = 10
- Filter area = 0.5
- Pump power = 0.75
- Electricity price = 0.28
- Flow rate needed = 40 000 / 1000 / 6 = 6.666 67
- Turnover with your pump = 10 > 0 ? 40 000 / 1000 / 10 : 0 = 4
- Daily run time for one turnover = 10 > 0 ? 40 000 / 1000 / 10 : 0 = 4
- daily_kwh = 0.75 * 4 = 3
- Daily pump cost = 3 * 0.28 = 0.84
- Annual pump cost = 0.84 * 365.25 = 306.81
- Filtration rate = 0.5 > 0 ? 10 / 0.5 : 0 = 20
- Filter is not overloaded = 20 <= 37 ? 1 : 0 = 1
- Turnovers in 24 hours = 4 > 0 ? 24 / 4 : 0 = 6
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- flow needed = volume / turnover time
- filtration rate = flow / filter area
A variable-speed pump running longer at lower speed uses far less energy for the same turnover, because pump power goes as the cube of flow.