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Thread: How often to backwash DE filter?

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    How often to backwash DE filter?

    I think this discussion was talked about in 2010. But like to get a new response!

    I have a Hayward 48sf DE filter. PB suggested to backwash every month and clean twice a year. When I cleaned my filter for the first time in Sept.2013, psi gauge indicates 25psi after cleaned. Also when I backwash monthly, it also indicates 25 psi after backwashed. I had this pool now about 9 mo. and every month the psi gauge indicates 27 psi, only 2 psi increase a month.

    (25 psi x 25% = 32 psi) Should I just wait till I see 32 psi before backwash and continue to clean twice a year? I think I'm just wasting money on DE powder... Thanks

    John
    14,000 gallon IG DiamondBrite pool with 2 ea. waterfalls and slide, Hayward Tristar 2.0 HP 2-speed pump, Hayward 3/4 HP waterfeature booster pump, Hayward 48sf DE filter, Hayward PS4 wireless controller, 1 skimmer and 4 returns, Polaris 280 pressure cleaner w/booster pump, 7 x 7 spa w/6 jets, TF-100 Test Kit w/speed stir

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    Richard320's Avatar
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    Re: How often to backwash DE filter?

    Yes.

    However, I would take my baseline reading after a teardown and thorough cleaning. You'd be amazed how much stuff stays stuck to the grids. Check the pictures in this thread: extremely-dirty-d-e-filter-help-t60455.html
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Mod Squad jblizzle's Avatar
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    Re: How often to backwash DE filter?

    I agree with Richard. You should figure your baseline pressure after a thorough cleaning: use-and-care-for-de-filters-t4086.html

    And then only backwash when the pressure rises 20-25%. Recharge with about 80% the normal DE amount. And then break it down once a year. Sounds like you are doing more work than you need to.

    That is also higher than usual pressures ... likely due to the very powerful pump and low-to-mid sized filter. It is a good size for your pool volume, but might be a little small for your big pump (at least when running on high).
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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  4. Back To Top    #4

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    Re: How often to backwash DE filter?

    Thank you for the info.

    After bi-annual cleaning and monthly backwashing, my baseline has been 25psi. Must be the big pump and small filter set up. But thats ok, I like having the extra water circulation. I think i will start backwashing only when gauge indicates past 30psi. Right now its indicating 28psi, only rised 3 psi in 90 days. BTW, the gauge does read 0 when pump is off, also it indicates 8 psi on low speed.

    Thanks, again. Love this website

    John
    14,000 gallon IG DiamondBrite pool with 2 ea. waterfalls and slide, Hayward Tristar 2.0 HP 2-speed pump, Hayward 3/4 HP waterfeature booster pump, Hayward 48sf DE filter, Hayward PS4 wireless controller, 1 skimmer and 4 returns, Polaris 280 pressure cleaner w/booster pump, 7 x 7 spa w/6 jets, TF-100 Test Kit w/speed stir

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    Mod Squad jblizzle's Avatar
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    Re: How often to backwash DE filter?

    Wow. 8 psi on low seems really high to me as well. Mine barely registers.
    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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    pwrstrk's Avatar
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    Re: How often to backwash DE filter?

    Mine on low reads 2 psi.
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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