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Thread: Backwash - how often?

  1. Back To Top    #1

    Join Date
    Jul 2015
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    Scituate, RI
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    Backwash - how often?

    How often do you guys backwash? Do you do this on a steady schedule, or base it on the pump pressure. My pump has been in the "green" zone for about 1.5 weeks. It has risen 1 psi, but this is due to my adding of 2.5 cups of DT.

    Thanks,

    Bob
    Intex Ultra Frame 16 x 48 (5000 gal) - Fresh Fill on 7/13/15
    Intex Model ECO 20110 Sand Filter/SWG (2150 gph)
    Intex Deluxe Surface Skimmer
    TF-100 Test Kit, Taylor K-1766 Cloride Drop Test, LaMotte Borate Test Strips, Speed Stir

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    Re: Backwash - how often?

    The recommendation is to backwash only when psi goes up around 25% over clean.

    Next time you do backwash, check the psi. Don't trust the "green". You can always use a sharpie to tic the clean psi on your gauge, calculate 25% higher and then tic that.

    Also, check your gauge once in a while to make sure it goes to zero when you shut it off.

  3. Back To Top    #3

    Join Date
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    Re: Backwash - how often?

    Thanks. It's clean/nominal, pre-DT add, is about 7.5 psi. My DT addition brings it up to 8.5 psi. It's running at about 9.5 psi (my 25% mark would be about 10.63 psi, but the gauge is not nearly that precise (and probably not that accurate as well)). I may have to look around for a better gauge.
    Intex Ultra Frame 16 x 48 (5000 gal) - Fresh Fill on 7/13/15
    Intex Model ECO 20110 Sand Filter/SWG (2150 gph)
    Intex Deluxe Surface Skimmer
    TF-100 Test Kit, Taylor K-1766 Cloride Drop Test, LaMotte Borate Test Strips, Speed Stir

  4. Back To Top    #4
    Mod Squad jblizzle's Avatar
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    Re: Backwash - how often?

    I see you have the TF-100, they also sell really nice gauges there.
    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
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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  5. Back To Top    #5

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    Re: Backwash - how often?

    I am pretty sure your 25% should be based off of 7.5, not the post DE of 8.5. My clean pressure is way higher so I have more wiggle room between clean and "dirty".

    TFtestkits sells gauges!

    - - - Updated - - -

    Hahaha. Great minds...! Cross-post

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    Mod Squad YippeeSkippy's Avatar
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    Re: Backwash - how often?

    I only backwash once *maybe* twice a summer? I just don't get much to require it. Gauge works fine.

    I have read here that over-doing the back washing can actually make the filter medium less effectiv3 (a slightly dirty filter works better than a pristine clean one).
    Maddie :) 12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
    Our pool build--> Our Pool Solved Our Sloping Yard Skippy's Cheap Pool Cooler -->Skippy's New Fountain

  7. Back To Top    #7
    Messman750's Avatar
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    Jun 2015
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    Re: Backwash - how often?

    Skimmer socks and my dolphin.very few back washing a for this pool owner!
    32x16 inground chlorine. 23000 gallon with diving board
    vinyl liner 1hp hayward super pump. Waterway sand filter new in 2014.
    maytronics dolphin m200 robot. I live in central NY.
    TF100 kit Taylor speedstir. Sonos audio

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