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Thread: Backwash Process???

  1. Back To Top    #1

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    Backwash Process???

    So I thought I knew how to properly backwash my DE filter but then a guy at the pool store told me to do this:
    Backwash - Filter - Backwash - Rinse - Filter

    What is the proper sequence of operations for backwashing?

    He also told me I only add 1/2 the DE stated on the filter after the initial fill (i.e. when you open you put in the full amount, after that only 1/2 after each backwash). Is that true???
    30,000 Gallon Inground, Vinyl Liner
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    Pentair Legend Platinum w/ PB4 Booster
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    Richard320's Avatar
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    Re: Backwash Process???

    Sounds like he's confusing DE with Sand filters.

    Rule of thumb is to replace 80% of a clean fill. It never washes out completely, but if you watch the outlet hose, you'll see this dark cloudy mess then it gets clearer and then it just stops changing.

    Just for my own peace of mind, I tore my filter all the way down and blasted the grids clean so I'd know what my clean pressure is. The next time I backwashed then opened the filter and hosed the grids off while it was still set to backwash. I looked like maybe 20% was still stuck there.
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    Mod Squad jblizzle's Avatar
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    Re: Backwash Process???

    I do similar but do not have the filter step. Alternating between backwash and rinse a few times helps remove more of the DE.

    Posted from my Droid with Tapatalk ... sorry if my response is short
    Jason, TFP Moderator
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  4. Back To Top    #4

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    Re: Backwash Process???

    80% - gotcha....

    Backwash - Rinse - Backwash - Rinse - Filter....gotcha

    I also read on some post that you're supposed to wait 30 seconds between rinse and filter. Any logic to that???
    30,000 Gallon Inground, Vinyl Liner
    DE Filter & Pentair IC40 SWG
    Pentair Legend Platinum w/ PB4 Booster
    Pentair Kreepy Krawler Prowler Robot

  5. Back To Top    #5
    Mod Squad jblizzle's Avatar
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    Re: Backwash Process???

    I can not think of any logic to that ... For sand I could imagine waiting between backwash and rinse/filter to allow the sand to settle ... but not for DE.

    Repeat the Backwash - Rinse cycle as much as you want ... if the water is still dirty in backwash, keep doing it.

    Also, some people recommend adding the DE while in the Rinse mode (so that any DE that makes it past the filter does not go in the pool). I have always done it on filter and never seen anything make it to the pool.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
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