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Thread: Sand filter

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    Sand filter

    my sand filter says: Effective filtration area 3.14ft2 Filtration rate 20 gpm/ft2 filtration and back wash design flow rate 62 gpm Does this mean that it filters 62 gallons a min?

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    Mod Squad jblizzle's Avatar
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    Re: Sand filter

    No. The rate it will filter depends on your pump size. Generally filters list the maximum flow rate that you should use . But in reality the lower the flow rate the better the filter will work.
    Jason, TFP Moderator
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    Mod Squad woodyp's Avatar
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    Re: Sand filter

    Your math indicates that the filter is CAPABLE of filtering at that rate I think. Just depends on the flow rate it is being fed. Any pump higher than that is a waste. Again, a little slower is better.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
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    duraleigh's Avatar
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    Re: Sand filter

    So if I am reading brandon1's post correctly he has 3.14 sq ft of filtration area and his acceptable (max, sort of) rate is 20 gpm x 3.14 for 62.8 gpm. Is that right?

    That also means that any pump pushing more than 62 gpm into that filter is overkill, too, right?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Mod Squad woodyp's Avatar
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    Re: Sand filter

    That's sure what I think!
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

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    Mod Squad jblizzle's Avatar
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    Re: Sand filter

    The 63 GPM might be the design limit for public applications. I know some filters give a rating that gives the maximum allowed rates for public pool code. Usually a private pool can run higher flow rates. But again, slower is usually better.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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