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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
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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).
    My Amazon Smile for November12K 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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