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Thread: Filter 'design flow rate' vs pump flow rate..

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    Join Date
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    Filter 'design flow rate' vs pump flow rate..

    If my sand filter has a 'design flow rate' of 63GPM, and the 'maximum recommended system flow rate' by pipe size is 45GPM (for 1 1/2" piping) does this basically mean that my pump is moving 45GPM because I have 1.5" piping or that they are recommending that the system doesn't pump more than 45GPM?

    Either way if my pump is moving less than the design flow rate of the filter, is that a good or bad thing?

    The pump by the way is a Hayward Tri-Star with 1.85 brake horsepower - 1 full rate HP and the filter is a Hayward SM2506T with 3.14 ft2 of filter area (300lbs of sand).

    Thanks.
    16x28 Roman, 55000 litres, salt water, Zodiac Duoclear 130 (mineral cartridge removed!!!), inground, vinyl liner
    Hayward Tri-star VS900 (1.85 HP) pump, Hayward C3030 cartridge filter
    Nine Techno Solis 4x10 solar panels, Jandy LX 250 natural gas heater
    Jandy Aqualink PDA with Sub Panel Power Centre

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    JasonLion's Avatar
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    Re: Filter 'design flow rate' vs pump flow rate..

    There is no absolute limit, a large pump will move lots of water even in small pipes. Exceeding the flow rate of the pipes really just means that you are wasting energy.

    The design flow rate of the filter is more important. The filters ability to filter falls off when you exceed the design flow rate. Just a little over is no big deal, filtering won't be perfect but it will be alright, but a lot over can damage the filter.

    Your pump and filter go together alright. We recommend using a larger filter and a smaller pump, but that combination isn't to bad. You will be exceeding the flow rate of your pipes, which means you are wasting some electricity compared to a more balanced system, but again not a serious problem (unless your electric rates are really high).
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Filter 'design flow rate' vs pump flow rate..

    Thanks for the reply.

    I'd always assumed I had 2" pipes, but (after four years ) I just discovered that they are 1.5" (though I 'think' the flexible section from the top of the pump to the filter is 2" for some reason).
    16x28 Roman, 55000 litres, salt water, Zodiac Duoclear 130 (mineral cartridge removed!!!), inground, vinyl liner
    Hayward Tri-star VS900 (1.85 HP) pump, Hayward C3030 cartridge filter
    Nine Techno Solis 4x10 solar panels, Jandy LX 250 natural gas heater
    Jandy Aqualink PDA with Sub Panel Power Centre

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    Re: Filter 'design flow rate' vs pump flow rate..

    So I am curious now, If I am totally mismatched. When I bought my pool package the pump and filter I was given was a Hayward Powerflo LX 1.5 hp rated at 70GPM. The filter is a dreamline S190TSCP with eff filter of 1.8ft squared and a filter and BW rate of 25 BPM/ft squared. I think it was BPM. It has a design flow of 45 GPM. I run about 15 pounds pressure using I think 100 lbs pea pebbles and I think 25 lbs of Zeobrite. It was 1/2 and 1/2. My pool is clear no issues pressure holds steady. But with a pump at 70 GPM and a filter design at 45 GPM, is this bad? The valve is a HAyward 7 way Sp0714tx. Flow is like a little whirlpool where it gets a little flow going, but my aqualuminator has a little spray out the top kind of like a little fountain. Pentair said it was normal. I use 1 1/2 flex hoses. This was installed last July. Dealer is reputable in this area and he said pump filter were matched good, but now I wonder reading some posts. Any opinions or am I worrying for nothing,
    15'X30'X52" AGP AquaSports Grande Buttress Free (10,620 Gallons), Hayward Dreamline S190 W Zeobrite, 1.5 HP Hayward PowerFlo LX, AquaLuminator Light+ fountain attachment, Pool Rover, Tf-100 test kit, Speed Stir.

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    Re: Filter 'design flow rate' vs pump flow rate..

    Quote Originally Posted by rjg202 View Post
    So I am curious now, If I am totally mismatched. When I bought my pool package the pump and filter I was given was a Hayward Powerflo LX 1.5 hp rated at 70GPM. The filter is a dreamline S190TSCP with eff filter of 1.8ft squared and a filter and BW rate of 25 BPM/ft squared. I think it was BPM. It has a design flow of 45 GPM. I run about 15 pounds pressure using I think 100 lbs pea pebbles and I think 25 lbs of Zeobrite. It was 1/2 and 1/2. My pool is clear no issues pressure holds steady. But with a pump at 70 GPM and a filter design at 45 GPM, is this bad? The valve is a HAyward 7 way Sp0714tx. Flow is like a little whirlpool where it gets a little flow going, but my aqualuminator has a little spray out the top kind of like a little fountain. Pentair said it was normal. I use 1 1/2 flex hoses. This was installed last July. Dealer is reputable in this area and he said pump filter were matched good, but now I wonder reading some posts. Any opinions or am I worrying for nothing,
    Hi there, I was wondering if i had my equipment mismatched as well? I have a 13500 gallon pool with the same exact pump and filter as you. Just had it installed last august. Just doesnt seem to be filtering my pool correctly. Have you found any answers to your question yet?
    Pool Newbie! 24ft above ground pool. 13500 gallons, 1.5 hp hayward power flo lx pump 70 GPM, Hayward d dream line high rate sand filter 45 GPM filter

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