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Thread: Dual Filters

  1. #1
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    Dual Filters

    I was curious is it any benefit if I were to place two filters inline with each other (sand filters). Or If I were to place them in parallel using a V pipe? Is there any real benefit???
    13,500 gallon above ground round pool. Vinyl Liner. Hayward S244T 3.1 cu ft sand filter. Hayward Powerflo 1HP pump (single speed induction). HTH 6-way test kit.

  2. #2
    Mod Squad jblizzle's Avatar
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    Re: Dual Filters

    I am no expert but would guess not much. I would think a large properly sized filter would be cheaper than 2 smaller ones. In series you would be adding more head resistance. In parallel you might reduce the head but still think 1 big would be better/cheaper /simpler than 2 smaller ones.
    Jason, TFP Moderator
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  3. #3
    Senior Member
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    Re: Dual Filters

    On our old inflatable ring pool I upgraded to a sand filter (best thing I ever did for it). I then would use the old filter to induce a whirlpool. This circulated the water better, and helped condense the dirt/bugs into the center for easier cleaning.

    Are you having a particular problem that is leading you to consider a second filter?
    Intex Ultra Frame 18' X 48" 7600 +/- gallons
    Columbia 50 LB sand filter/ HP pump, $$ WELL spent(2nd best thing bought for the pool)
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  4. #4
    Administrator JasonLion's Avatar
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    Re: Dual Filters

    There is hardly any advantage to using multiple filters, though there are a few very rare situations when it might have some very small advantages. The only two times that is normally done are: 1) when you need more water flow than even the largest filters allow for. Then you can setup two, or more, filters in parallel. 2) When you need extremely high reliability (like at a public water park) and so have several sets of equipment and can continue in operation even if one entire set of equipment breaks.

    Using two of the same kind a filter in series is pretty much a complete waste of time. Using two in parallel allows additional water flow, but it will cost less and be more reliable to simply get a single larger filter (if one is available). There are some very minimal advantages to using a sand filter as a pre-filter for a DE filter (less DE filter cleaning), but not nearly enough advantage to justify the extra expense and extra maintenance.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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