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Thread: Adding DE to the Sand Filter

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    Adding DE to the Sand Filter

    I've read that you should add DE to your sand filter to make it more effective until the pressure goes up by 1 psi. Is there a reason why you shouldn't go higher, say 2, 3 or even 5 psi? Just curious because I have seen a significant difference in the water clarity after only 2 days after adding DE.

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    Mod Squad pooldv's Avatar
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    Re: Adding DE to the Sand Filter

    I'm not sure, but my guess is that it will clog up your filter too much or too fast. If you are around to monitor the pressure and backwash as needed then you can probably try more if you want. Glad it is working for you.

    Here is an article from Poolschool about it,
    Pool School - Add DE to a Sand Filter
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    Re: Adding DE to the Sand Filter

    It depends on what your "normal" pressure is.

    The TFPC recommendation is that you backwash your filter whenever the pressure increases by 25%. In my case, that translates to ~3.5 psi.

    The reason given is energy efficiency.
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    Richard320's Avatar
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    Re: Adding DE to the Sand Filter

    Quote Originally Posted by rnaval View Post
    I've read that you should add DE to your sand filter to make it more effective until the pressure goes up by 1 psi. Is there a reason why you shouldn't go higher, say 2, 3 or even 5 psi? Just curious because I have seen a significant difference in the water clarity after only 2 days after adding DE.
    Yes, there is. It will restrict the flow.

    If your water is dull and cloudy and you add DE, you'll see the pressure rise 2,3, or even 5 PSI really quick anyway. Some people report within hours.
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