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Thread: Adding DE to sand filter question

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    Adding DE to sand filter question


    It's the first time I'm trying this and had a few questions.

    I measured my current PSI after a backwash and rinse to get a benchmarck of my current PSI which was 20.

    I mixed in half a cupy of DE with pool water and I poured directly in the skimmer. I didn't see an increase of PSI so I guess this where I add more but had a few questions before I proceeded.

    1. How long should I wait until the PSI readings go up?
    2. Should any valves be shut off when pouring this directly in the skimmer? Everything is still currently open, my chlorinator, my heater, my return jets, my bottom drains.
    3. How long after adding is it safe for swimmers to swim?

    18' x 36" Ovalish 80,000 Litre Vinyl IGP. 2 speed 1HP Hayward pump SP2607X102S. 300 Pound Sand Filter. Summit Sum5 Heat Pump, Goldline Controls Aqua Logic P4 System, T-CELL-15 SWG, Aqua Pod Remote Control, Pentair 7845xx02 light.
    TF-100 Test Kit, SpeedStir Stirrer, Pool Chemist in training.

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    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Adding DE to sand filter question

    1. continue to add 1 cup each time until you geyt the psi rise....usually about 30 minutes max.

    2. No. leave everything as is

    3. Swim anytime
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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