WATER CIRCULATION
In general the total volume of swimming pool water should be turned over at least 1.5 to
2.0 times per day through the filtration system. Where traditional single speed pumps are
used, this is normally achieved within an 8 hour period.
With the introduction of energy efficient multi-speed and variable speed pumps it has
become more complicated than just running the pump for a certain amount of time.
It is important to ensure you are maintaining at least the minimum daily turnover of water.
If using a multi or variable speed pump at low speed, you may need to consult the pump
documentation to help determine the approximate flow rate you have.
If daily turnover is not maintained the chemical and sanitizer distribution in the water may
not be uniform, and water test samples may not be representative of the entire pool
volume. This can make chemical dosing inaccurate, and can increase the chance of
forming black-spot algae on your pool surfaces.
See examples below:
Traditional Fixed Speed Pool Pump
Pool Volume: 50,000 Litres
Pump Rated Flow: 210 LPM (Litres per minute)
Turnover Rate: approx. 4 hours. (238 minutes)
Time to turn over 1.5 x pool volume: approx. 6 hours (357 minutes)
Time to turn over 2.0 x pool volume: approx. 8 hours (476 minutes)
Energy efficient Variable Speed Pump, operating at approx ½ flow rate
Pool Volume: 50,000 Litres
Pump Approximated Flow: 105 LPM (Litres per minute)
Turnover Rate: approx. 8 hours. (476 minutes)
Time to turn over 1.5 x pool volume: approx. 12 hours (714 minutes)
Time to turn over 2.0 x pool volume: approx. 16 hours (952 minutes)
This example illustrates that when you halve the flow rate, you effectively need to double
the filtration time.
When performing manual pH and chlorine tests for comparison with ASP results, always
obtain the sample as close as possible to the filtration system inlet – usually the skimmer
box. This place will be most representative of the readings acquired by the Pool Lab ASP.
Also ensure the displayed results are up-to-date by initiating a water test via the ASP
TOOLS menu.
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