Pump(s) and filter for overflow pool.

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Pump(s) and filter for overflow pool.

Postby Breizh29 » Sat Mar 04, 2017 12:50 pm

Hello everyone,

I have a little trouble calculating my needs in pump(s) and filter of my overflow swimming pool under construction. :roll:

I would like mirror pool owners to share their configuration if possible and indicate whether they are experiencing problems or not.

I thank you in advance :wink:
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Re: Pump(s) and filter for overflow pool.

Postby Klondyke » Wed Mar 08, 2017 7:54 pm

My experience:

There are diagrams and clever schemes for dimensioning of pumps and filters. The pump capacity (as printed on its label is further reduced by the resistance of the pipes (diameter and length, number of elbows), check (return) valves, outlets jets, number of sucking intakes, resistance of the sand filter, height position of the pump. Different pressure conditions (and so the flow) are when inlet to the pump only from the pool bottom or only from the OF tank, or from skimmer(s).

For my 50,000 m3 pool I have bought my filter in GH (7,500B) and the pump (7,500B) at a (not pool) pump specialist (GH also have a similar pump). The pump label shows a range of 4 - 24 m3/h (with max H 16m), 1.1 kW (1.5HP), it gives me some 12 m3/h, roughly checking, I should better have the piping with a larger diameter.

I do not think that I would fare better when buying at a pool specialist for some 5fold price. The pump is running 4 - 6 hours every day, keeping the water clear without much chemical throughout the year. With a smaller pump the water exchange can be achieved by a prolonged filtering. The minimum and maximum of the necessary filtering time can be tested, whether a difference will be apparent.
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Re: Pump(s) and filter for overflow pool.

Postby Breizh29 » Thu Mar 09, 2017 8:16 am

Klondyke wrote:My experience:

There are diagrams and clever schemes for dimensioning of pumps and filters. .........

Please Klondyke, where can I find these diagrams and clever schemes?
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Re: Pump(s) and filter for overflow pool.

Postby Klondyke » Fri Mar 10, 2017 12:52 pm

Breizh29 wrote:
Klondyke wrote:My experience:

There are diagrams and clever schemes for dimensioning of pumps and filters. .........

Please Klondyke, where can I find these diagrams and clever schemes?


I used to see it when browsing sites dealing with swimming pools and pumps. Try to google.
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Re: Pump(s) and filter for overflow pool.

Postby jazzman » Sat Jun 10, 2017 9:18 pm

It's not rocket science - at least when one can get the information from the real experts and not those who are just interested in selling the biggest and most expensive pumps and filters.The state laws of two different developed countries who have states in tropical climates, the USA and Australia, stipulate that for commercial and public pools (which also means tiny pools behind small hotels and guesthouses), the pool volume must be 'turned over' once every 24 hours in not more than 6 hours pumping time.
The calculation just requires some elementary school math: just multiply l x w x d (in metres of course) to get the pool volume, add the volume of the balance tank, and divide by 6.
That will give you the required flow rate in m3/hr. A good then pool website here in Thailand will state the flow rate of the pumps and filters they have on offer. The flow rate of most most pool pumps is quoted at a 4 - 10m 'head'. Pool pumps (generally up to 1.5HP) come with 1.5" ports for the 1.5" PVC pipes used in smaller pools, and 2" ports on pumps over 1,5HP for larger pools. Filters should obviously match the flow rate of the pump, and the pipe size.

Good pool pumps from a recognised brand from a respectable pool firm will certainly not be five times more expensive than the ones in GH. Slightly more expensive, yes, but the quality will be infinitely better and if looked after they will last for 10 - 15 years.
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Re: Pump(s) and filter for overflow pool.

Postby Klondyke » Sun Jun 11, 2017 10:08 am

jazzman wrote:Good pool pumps from a recognised brand from a respectable pool firm will certainly not be five times more expensive than the ones in GH. Slightly more expensive, yes, but the quality will be infinitely better and if looked after they will last for 10 - 15 years.


You might be right, not always five times. However, you will be lucky if you find a pump (at specialist shop) cheaper than three times more expensive. And that my (cheap) pump 1.1 kW (1.5HP) motor was already re-winded by a village people because of being flooded and again being run too early afterwards (in my care). After 5 years still running.

And the prices of filters and other equipment?

the USA and Australia, stipulate that for commercial and public pools (which also means tiny pools behind small hotels and guesthouses),the pool volume must be 'turned over' once every 24 hours in not more than 6 hours pumping time.


In Europe (esp. Germany) they stipulate 2 exchange daily what is really exaggerated. I say I exchange only the water used, the unused (untouched) water I keep aside (just kidding).

I have many times experienced different time frames of the filtering (either intentionally changed or just incidentally), no real visible difference. Of course at the water that was clean and clear over a long period, 1 - 2 day fallouts do not matter.

Of course when the water starts be troubled, either by algaes and/or by iron (rediscovered by too much chlorine) the curing will get the best results by a prolonged filtering and a frequent backwashing of filter - sometimes twice a day. And if you can observe the backwash drain water you will see (and be satisfied) how much you are getting off the dirt.

BTW, as you mentioned "for commercial and public pools", this is a usual stipulation by the pool shops, not considering (and humble mentioning) that the private MickeyMouse pools do not need such overcare. Quite different conditions for our daily swimming (how many minutes per day?) against public pools where hundreds of uncontrolled people and kids come throughout the day.
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