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Joined: May 01, 2005 Posts: 1670 Location: Guadalhorce Valley, Málaga
Posted: Mon Sep 01, 2008 2:27 pm Post subject:
In the summer I run my filter for a continuous ten hours a day for my wife and myself and the flow rate is sufficient to turn over the entire 75-80 cubic meter capacity of my pool in just under four hours.
Optimum filtration times also depend on the size of the pump and filter in relation to the capacity of the pool as well as the bather load.
The total capacity of the pool should be capable of being turned over every four hours so check the flow which will be shown on the pump, probably in litres per minute or cubic metres per hour, then use the information to calculate the length of time it takes to turn over the total contents of the pool.
My 10x5 pool has a 1,5 hp pump with a flow rate of 18,5 cubic metres per hour but I have seen them with only 0,75 hp with a flow rate of about 12 m3/h which means that a pool of 75 m3 will take over six hours to turn over. In such cases the running time should be increased accordingly.
Pool pumps are designed to operate 24 hours per day seven days a week and, indeed, this is a legal requirement in respect of community pools.
Anything less is a compromise and is merely a money saving exercise.
Calculating flow rates is not that simple, although you are partially correct in turning the volume over twice in 24 hours as a minimum.
Despite the pump having a flow rate on the label you have restrictions in the pipework and filter which is how you get a pressure reading on the filter gauge - so you cannot do a simple calculation of pool volume / flow rate.
Additionally you will have 'quiet' areas in the pool where water has little movement and may not be circulated once in 24 hours let alone twice.
You can use the calculation as a guide only and add some on for the restrictions which depending on pump size, flow volume and pool size will generally work out to between 8~12 hours/day.
Additionally as Beachcomber so rightly points out do not be afraid when the pool is busy to run it for 24 hours/day - far cheaper than trying to recover a green pool.
Check your water balance at least once/day, hotels are every hour.
pH - 7.2~7.6
Those two are the minimum checks, there are a whole host of others to check and maintain critically.
By throwing handfuls of chemicals in the pool you end up with a chemical soup, chemicals should be measured and added as required in the correct amounts for a healthy pool - those orange labels with X's on are actually hazardous in the wrong quantities.
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