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Thread: Using DE in a sand filter

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    Using DE in a sand filter

    Is it safe to use DE in a sand filter? If so, how do you add it, how much and where do you get it besides a pool store? Is it effective? Will it really aid in spring start up?
    lartay

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    Simply add the DE into the skimmer, pump running, and allow it to be taken into the filter and deposited on the sand bed. The recommendation is to stop adding the DE when your filter psi increases by one lb.

    Will it help you? Perhaps....there are those here that swear by it and there are those, like me, that could see no difference. It certainly is neither harmful nor permanent so nothinhg ventured, nothing gained.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Just wondering Dave . . . with the DE added on top of a sand bed, do you stand to lose a lot of it during backwashes?
    The DE I'm familiar with is for household pests and is as fine as flour. Is DE for the pool filter much bigger granulate?
    20x40 30,000 gal IG Liner, Pentair II Sand

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    Rangerman,

    When you backwash, you lose it all and must replace it as before. To my knowledge it is identical in texture to that used for pests.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    DE for the pool is indeed as fine as flour. Around here you can get it at Home Depot for the same price as the pool stores. It goes for $14.95 for a 25 pound bag.
    26,000 Gallon Gunnite IGP
    2 HP Challenger High Head Pump
    60sf Nautilus DE filter
    Polaris 280

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