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Thread: Question about adding DE to a sand filter

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    Question about adding DE to a sand filter

    I read the how to and I followed to the instructions and added it until PSI increased by one. Came back a couple hours later and it had increased by 7 to 8 PSI so I backwashed again and it is back down to 14-15. This may be a stupid question, but the instructions said after the first time you will know how much to add so am I supposed to add that same amount every time I backwash or is the first time all I need? I had to buy it in a 25lb box and I didn't know if I was to keep adding it every time until I am out or how much to stop at. Thanks in advance for the replies!
    31,000G IG vinyl 20X40 True L. Hayward 1.5 superpump, Autopilot Pool Pilot Digital SWG, Hayward Model S244T 300lb sand filter, TF100 kit

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    Join Date
    Mar 2007
    Location
    Coastalish 'down easter'
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    4,160

    Re: Question about adding DE to a sand filter

    Don't sweat the question

    I add it until the psi stops having the HUGE rise.


    The amount you need to add should be constant - all you're doing is coating the sand with DE (the amount depends on the size of your filter and the flow from your pump).

    As such, once you know that you need "X" amount of DE - it will stay constant
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

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    Re: Question about adding DE to a sand filter

    Thanks for the reply! What I guess I should've asked was do I add DE to the sand filter every time I backwash from here on out or do you just add it a couple of times and never again?
    31,000G IG vinyl 20X40 True L. Hayward 1.5 superpump, Autopilot Pool Pilot Digital SWG, Hayward Model S244T 300lb sand filter, TF100 kit

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    Jamison04's Avatar
    Join Date
    Jun 2011
    Location
    Tecumseh, OK
    Posts
    553

    Re: Question about adding DE to a sand filter

    Yes you will had to add it everytime you backwash as that flushes out all the dirt and debris that is caught up in the sand itself including the DE.

    24'x52" Artesian w/ Portifino liner - Hayward 1hp powerflo matrix w/24" sand filter - AquaTrol RJ SWG. Solar heating to come. -

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