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Thread: filter backwashing frequency

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    filter backwashing frequency

    Hello all, I have a question regarding backwashing my DE filter. I have a relatively small pool (~12K gal.) and a 60 sq. ft. DE filter. I believe this is a pretty large filter for the size pool that I have, but I'm assuming that's probably a good thing. Anyway, my plan is that I try to take it apart and do a full cleaning every 6 months. I've noticed that after 6 months, the pressure gauge normally has not moved up very much at all. Because of this, I have rarely backwashed the filter, thinking that I only needed to do it if the pressure is up several pounds over the 'fully-clean' setting. Is this OK, or should I be backwashing it regularly regardless of whether the pressure has risen much or not?

    Thanks,
    Greg
    12000 gal IG pool/spa combo,60 sq ft Jandy DEL filter,2 hp Jandy Stealth pump,Jandy LX400 400K BTU gas heater,Pentair Rainbow 300 off-line feeder (never gets used),Jandy Aqualink RS4 with PDA remote,3 Jandy 12" sheer descent waterfall features, Dolphin Oasis Z5 robotic cleaner

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    JasonLion's Avatar
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    Re: filter backwashing frequency

    We recommend cleaning the filter when the pressure goes up 25% over the clean pressure, but not less than once a year.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: filter backwashing frequency

    Hi JasonLion, I'm assuming you're talking about a full cleaning, right? What about backwashing in between cleanings?

    Thanks,
    Greg
    12000 gal IG pool/spa combo,60 sq ft Jandy DEL filter,2 hp Jandy Stealth pump,Jandy LX400 400K BTU gas heater,Pentair Rainbow 300 off-line feeder (never gets used),Jandy Aqualink RS4 with PDA remote,3 Jandy 12" sheer descent waterfall features, Dolphin Oasis Z5 robotic cleaner

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    JasonLion's Avatar
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    Re: filter backwashing frequency

    I meant backwashing, unless it has been a year, then a full clean out. If you need to backwash frequently, then something like ever tenth or twentieth should be a full clean out.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Richard320's Avatar
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    Re: filter backwashing frequency

    An annual cleaning sounds right to me. I have a 48 sft filter on a 16K pool and it can go 9 months between cleanings sometimes. And I use a manual vacuum, so everything I suck up ends up in the filter. You have a bigger filter and a smaller pool and a robot, so I imagine the worst of it ends up in the robot filter.
    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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    Re: filter backwashing frequency

    Thanks guys. If backwashing is not required unless the pressure is 25% over 'clean', then I've been on track. I will likely start going a full year now between full take-apart cleanings because of the new robot.

    BTW, if I do ever backwash, how much DE should I put back in? In the past if I've backwashed I've put 1 scoop back in (it takes about 10 scoops when starting fresh after a full take-apart).

    Thanks,
    Greg
    12000 gal IG pool/spa combo,60 sq ft Jandy DEL filter,2 hp Jandy Stealth pump,Jandy LX400 400K BTU gas heater,Pentair Rainbow 300 off-line feeder (never gets used),Jandy Aqualink RS4 with PDA remote,3 Jandy 12" sheer descent waterfall features, Dolphin Oasis Z5 robotic cleaner

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    Mod Squad jblizzle's Avatar
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    Re: filter backwashing frequency

    You should add about 80% of the full DE amount after a good backwash.
    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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