The Flow of the Swimming Pool Water is calculated to ensure that there is an appropriate turnover of water and good mixing of water in the pool.


Flow meters should be installed and operational to prove this calculated flow and confirm that the turnover of the pool is correct as recommend by The PWTAG Codes of Practice. If there is no flow meter or the current unit is faulty then new Flow Meters can be retro fitted to ensure accurate flow rates.”


What is the Turnover Period (in Hours) for your pool?
That is the length of time it takes the total pool water volume to go from pool to plant room and round the pool again. For example, in a
general use a 25m pool it takes 2.5 to 3 hours for all the water to pass through the filters, as recommended by PWTAG.

Calculate from:-

  • Water volume m3
  • Circulation rate m3/h

Water volume = L x W x D of the Pool e.g. 25m x 12m x 1.5m average depth = 450m3

Circulation rate (take details from manufactures plate on pump) e.g. 150m3 per hr.

Therefore Turnover period = 450 = 3 hours



FlowVis® is the most advanced, affordable, and reliable precision flow meter designed specifically for pools, spas, fountains, and water features. Ingenious in concept and flawless in operation, FlowVis® is a revolution in reliable flow measurement.



FlowVis® is ≥97.9% accurate, making it the most accurate flow meter designed specifically for pools, spas, fountains, and water features.



With the ability to vary the flow, it is important to set the required flow rates for each aspect of your pool. Skimming efficiency can only be realized at optimum flow rates.



The ability of your heater to impart thermal energy into the water passing through it, has a direct relationship to the flow rate. Knowing the flow will allow you to optimize the heaters efficiency and reduce your operating costs



Operating the pool pump at too high of a flow rate will consume excessive amounts of chemicals and increase your operating costs.



Filter efficiency has a direct relationship to flow rate. Setting the optimum flow through your filter will allow it to perform at its peak efficiency - thereby resulting in a clean pool.