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Thread: GPM for backwashing Quad DE 80?

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    tsunami's Avatar
    Join Date
    Sep 2008
    Oceanside, CA

    GPM for backwashing Quad DE 80?

    Is there a minimum/maximum GPM requirement for backwashing a Quad DE 80? It has a 2" slide valve on it and I was thinking of backwashing it for 3 minutes at maybe 30 GPM or so. Any recommendations?

    I've looked in the filter manual and couldn't find any mention of it. But I've heard that there's a possibility of blowing out the cartridges when plumbing the Quad DE backwards(output/input are opposite on a Quad DE vs. a regular DE filter). But wouldn't backwashing the filter have the same effect on the cartridges as plumbing it backwards?
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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: GPM for backwashing Quad DE 80?

    That filter is rated for something like 150 GPM, you are not going to damage it by backwashing. A conventional cartridge filter can be damaged by backwashing, or plumbing backwards, but not the kind you have.

    I would use a higher GPM, perhaps something around 60 GPM. You want to be sure to wash out as much of the DE as possible.
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