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Thread: DE filter for 85,000 gallon pool

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    DE filter for 85,000 gallon pool

    My father in law was here looking at my small 10,000 gallon pool which is filtered by a 36 sq. ft Pentair Plus DE filter attached to a 3/4 hp pump. He has an 85,000 gallon pool that is currently being filtered by an old large sand filter that is attached to a 5HP pump.


    Would a 60 sq. ft Pentair Plus DE filter be adequate to filter his large pool. What about attaching to such a large motor/pump?
    10,000 gallon
    Viking Freeform Fiberglass Inground Pool. FNS Plus DE Filter Pentair Challenger .75hp pump

    NC KANSAS44

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    Lershac's Avatar
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    Re: DE filter for 85,000 gallon pool

    Thats not a pool, thats a lake!
    (DIY):16K Gal 20X30 rectangular IG Gunite, w/spa, CCP 520 filter,2 Pentair VS pumps, 400KBTU Pentair gas heater, Heat Pump for cooling, **update5.25.2013** added an intellichem with acid pump that will control existing SWG. My Build Thread Here

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    JasonLion's Avatar
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    Re: DE filter for 85,000 gallon pool

    You don't really want to pair any residential filter with a 5 HP pump. That is just too much pump. Technically, the very largest residential filters could in theory work, but it would be marginal for that situation. We always recommend getting the largest filter you can, which, scaled up for that pool, would be something like three times the size of the largest residential filters. Putting two or three filters in parallel is done sometimes.
    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: DE filter for 85,000 gallon pool

    A 5 HP pump is BIG but so is an 85K Gallon pool!. Is he having a problem with the existing?

    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

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    Re: DE filter for 85,000 gallon pool

    It is very old and the sand compacts. They have cutting torch a hole in the side to jack hammer the sand out. So guess he is looking for something a little more modern. The pool was built in the '30's by his father. I don't know the age of the filter but I can attest that it is pretty old probably fifty years at least i would guess, maybe it is original...i don't know.

    So it looks like maybe the answer is a commercial sand filter with a better means for backwash/maintenance. I will google but can anyone with knowledge recommend a good commercial filter for this application?
    10,000 gallon
    Viking Freeform Fiberglass Inground Pool. FNS Plus DE Filter Pentair Challenger .75hp pump

    NC KANSAS44

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    Re: DE filter for 85,000 gallon pool

    http://www.poolequip.com/product.php?productid=730

    I'm sure you can find it way cheaper somewhere else.

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    JasonLion's Avatar
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    Re: DE filter for 85,000 gallon pool

    I was thinking of a THS3484, but Dbfan187 beat me to it.

    Another approach would be two Triton-C filters in parallel.
    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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