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Thread: using DE in a sand filter

  1. Back To Top    #1

    Join Date
    May 2016
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    California
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    using DE in a sand filter

    Hi,
    I am sure this has been discussed already, but my search terms (DE, sand, area) seem too generic to find the answer in the archives.

    I am looking into adding DE to my sand filter (Sta-Rite System 3, S8S70), and I have read that the small bags are better than the large ones (less mess).
    However I can't gauge the amount needed. My filter is 3.4 sqft, and the bags (EZ-DE Swimming Pool Diatomaceous Earth Filter Media) are sold for 36, 48, or 60 sqft DE filters.
    What is an optimal amount to use 2-3 times DE after backwash with my sand filter?

    Thanks!
    Gio

  2. Back To Top    #2
    Mod Squad pooldv's Avatar
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    Re: using DE in a sand filter

    Welcome to TFP!

    More here about adding DE to a sand filter, Pool School - Add DE to a Sand Filter

    Also, you can add your pool info to your signature so that we can better help you. More here, Pool School - Read This BEFORE You Post
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Mod Squad YippeeSkippy's Avatar
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    Re: using DE in a sand filter

    You don't need much at all. Mine takes about 2 cups to raise the filter pressure 1psi. Of course each time you backwash you're removing that DE, so you'd have to start again.

    I'd just buy the smallest amount I could to try it.
    Maddie :) 12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
    Our pool build--> Our Pool Solved Our Sloping Yard Skippy's Cheap Pool Cooler -->Skippy's New Fountain

  4. Back To Top    #4

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    Re: using DE in a sand filter

    Thank you! My thread was moved and only now I saw your replies.
    Thanks!
    gio

  5. Back To Top    #5

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    Re: using DE in a sand filter

    I bought a 25 lb box of DE, which seems to be about a 25 year supply for my sand filter... Next spring I'm going to introduce myself to the pool owners down the street and hope they have a DE filter.
    12,000 gal Diamond Brite indoor​ pool. Pentair Triton TR-60 Sand Filter +added DE, Lochinvar Energyrite ERN-200 gas heater, Pentair Multi-valve, Pentair SuperFlo VS pump, TF-100 kit, Pool Math App - iOS

  6. Back To Top    #6

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    Re: using DE in a sand filter

    Check the pricing. My 25# box was cheaper ($20.00) than the smaller bags at the pool store.

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