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Thread: ? about adding DE to sand filter

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    ? about adding DE to sand filter

    Sometimes to get extra polished, crystal clear water I backwash the filter and then add about 2-3 cups of DE to the skimmer and monitor the pressure. Works like a charm- especially after heavy rains, heavy pollen, increased bather load, also seems to clear up "sunscreen cloudiness". Other than having to closely monitor for pressure spike, are there any other concerns or contraindications?

    My reasoning for occasionally adding DE- basically, dirty sand filters better than cleaner, newly backwashed sand because then it's able to trap smaller and smaller particles, but usually it takes a long time for my sand to get dirty enough to increase the pressure 5-10 PSI. In order to prevent channeling of the sand, I try to backwash about every 7-10 days. Adding some DE is like adding "clean dirt" to the filter to increase its filtration surface area.

    Just wondering if this is a good practice or if it shouldn't be done.
    14'x28' vinyl liner inground 3.5-6' deep wedge hopper 15000 gal (used to say 13000- I calculated wrong), 1 hp pump with sand filter, 2 returns, 1 fountain, traditional chlorinated, pool house.

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    Re: ? about adding DE to sand filter

    Very common and often recommended. Usually you add enough DE until you get a 1psi rise in pressure.

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    Re: ? about adding DE to sand filter

    what should pressure guage read normally? mine is always between 9-10 psi on a hayward sand filter ,for a 24' above ground.
    mike
    Above ground 33 ft round 52 in. high
    Approx. 25000 gallons
    Hayward Dreamline Sand filter holds 250lbs sand
    Hayward CL-200 chlorinator
    Hayward 1.5 hp 67 GPM pump

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    Re: ? about adding DE to sand filter

    Quote Originally Posted by mtw
    what should pressure guage read normally? mine is always between 9-10 psi on a hayward sand filter ,for a 24' above ground.
    mike
    Depends on variables individual to each pool and hardware. Whatever you get with normal operation on a clean filter is usually it.

    If you want to try this, assuming your equipment is all sized properly, do a good backwash, note the pressure then add DE until you get a 1 psi rise. That's it

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