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Thread: Adding DE after backwash

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    Whatrymes's Avatar
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    Adding DE after backwash

    Okay, I have to ask. I know the conventional wisdom on this sight is to add a percentage (haven't looked up the number yet) of the required DE after a backwash. Seems logical. It's obvious that all of the DE will not leave the filter after a backwash, but should I override the instructions of the manufacturer? They say to add 100% (4 lbs) after I backwash.

    Thanks,
    Ed
    15 X 30 X 3.6 Ester williams AGP
    10,800 gallons
    Haywood EC40C90 DE filter 1 HP pump
    TF-100 Test Kit

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    Mod Squad woodyp's Avatar
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    Re: Adding DE after backwash

    I believe that magic number is 80%.
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    Richard320's Avatar
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    Re: Adding DE after backwash

    Yours is a bump-type DE filter, so it isn't backwashed in the same manner as a screen type. I would hope the banging would knock the DE off better than just running the water through backwards like a conventional filter. Don;t know what to tell you.

    You might want to change the thread title to reflect the bump type filter and hope someone with first hand experience sees it.
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    Whatrymes's Avatar
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    Re: Adding DE after backwash

    Good catch Richard, it is a bump style filter.
    15 X 30 X 3.6 Ester williams AGP
    10,800 gallons
    Haywood EC40C90 DE filter 1 HP pump
    TF-100 Test Kit

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    Mod Squad zea3's Avatar
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    Re: Adding DE after backwash

    Bumping is just to knock it loose to be re-distributed in the filter. Opening it up and hosing it out is the best way to clean a DE filter, then you give it 100%re-charge.
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    Whatrymes's Avatar
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    Re: Adding DE after backwash

    That's not necessary every cycle, back washing is fine for most of the season.
    15 X 30 X 3.6 Ester williams AGP
    10,800 gallons
    Haywood EC40C90 DE filter 1 HP pump
    TF-100 Test Kit

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