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Thread: Cleaning the filter -- clumps of DE?

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    Mr. Blue's Avatar
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    Cleaning the filter -- clumps of DE?

    I searched around on this topic, but didn't really find what I was looking for...

    I recently turned a complete swamp into a pool, and had a question about the DE in the filter.
    When I first got started, I decided to manually clean the filter. When I opened it up, there were large clumps of DE on the bottom of the filter tank and stuck to the filter grids....it had a clay-like consistency.
    Once I had finished the cleanup, I decided to clean the filter again. This time, I still noticed some large clumps of DE on the bottom of the filter, and some stuck to the grids. These weren't as clay-like, more soft, if you will.

    My question is, is this normal once the filter becomes dirty? Does the DE 'clump up' when it gets really dirty?



    If you are interested about what it looked like before and after, I created a thread here: 4-hard-days-worth-it-t59369.html
    23K Gallon Freeform Tile Inground
    Hayward Super II 1.5 HP -- Pentair FNSP48 DE Filter @ 120 GPM
    Polaris 3900 Sport (with Booster Pump)


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    frustratedpoolmom's Avatar
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    Re: Cleaning the filter -- clumps of DE?

    Yes its normal. Here where we winterize I suggest a mid-season cleaning and before winterizing the filter. If you are open year round I would recommend every 2-3 months, cleaning it as you did.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Mr. Blue's Avatar
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    Re: Cleaning the filter -- clumps of DE?

    Great, thanks for the reply.

    That is good to know; I didn't realize that it clumps up like that. With all of the junk that went through the filter while I was cleaning it, I wasn't very surprised to see a lot in there.
    23K Gallon Freeform Tile Inground
    Hayward Super II 1.5 HP -- Pentair FNSP48 DE Filter @ 120 GPM
    Polaris 3900 Sport (with Booster Pump)


    Pool School Attendee -- The TF-100 Test Kit and the Pool Calculator keep my pool Trouble Free -- BBB Supporter

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    Re: Cleaning the filter -- clumps of DE?

    Quote Originally Posted by frustratedpoolmom
    Yes its normal. Here where we winterize I suggest a mid-season cleaning and before winterizing the filter. If you are open year round I would recommend every 2-3 months, cleaning it as you did.
    Why would I need to do a mid-season cleaning? My pressure doesn't go up by more than 2.5 psi between open in May and close in September and the pool is crystal clear all season, thanks to BBB. Been that way for several years now. I just give it a good cleaning every fall close.
    Current: 28,000G 18'x36' I/G AnthonySylvan Plaster; Waterway 60 sq.ft. DE Filter; 1.0hp x 1.65 SF Two-Speed (B2982) WhisperFlo; 2004-Present
    Previous: 40,000G 20'x40' I/G Koven unlined WWII salvage 5/8" marine steel; Lomart Stainless Sand Filter; 3/4hp Hayward SuperPump; 1946-2003 (managed by me from about 1964)
    Ancient Taylor K-2000, upgraded with Taylor CH, TA, and FAS-DPD, and TFT CYA tests.

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    Re: Cleaning the filter -- clumps of DE?

    I'll chime in as one with similar questions. I've only had the pool for one year now, so not a lot of experience. I always have the DE clumping on the bottom.

    My pressure after a clean is around 21 psi, and last year at the end of swim season, it was only at about 23. I wonder if my grids need to be de-scaled or if that is normal. The filter was installed just before I moved in.
    23,000 IG Plaster pool w/ spa, Pentair FNS Plus 48 DE Filter, Hayward RS1000 Main pump, Polaris booster pump, CPSC48 SWG, Legend pool sweep. Dallas, Texas, Full sun, Taylor K-2006

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    harleysilo's Avatar
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    Re: Cleaning the filter -- clumps of DE?

    The rise in PSI of the filter is the indicator for back washing and in the case of a DE filter recharging of the DE when you are done.

    I ran my pool for 12 months and then due to low flow in the heater decided to do my first cleaning of my filter. Man, was it NASTY. No while i may be able to go another year without a breakdown cleaning i don't plan on it. I'm thinking my pattern will be clean it early spring, and clean it late summer. I think what affected mine the most was sunscreen (but of course really have no idea)....




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    Mr. Blue's Avatar
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    Re: Cleaning the filter -- clumps of DE?

    That's about what mine looked like except I also had some large clumps at the bottom (in between the grids and in the center of the base).
    23K Gallon Freeform Tile Inground
    Hayward Super II 1.5 HP -- Pentair FNSP48 DE Filter @ 120 GPM
    Polaris 3900 Sport (with Booster Pump)


    Pool School Attendee -- The TF-100 Test Kit and the Pool Calculator keep my pool Trouble Free -- BBB Supporter

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    frustratedpoolmom's Avatar
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    Re: Cleaning the filter -- clumps of DE?

    Quote Originally Posted by Durk
    Quote Originally Posted by frustratedpoolmom
    Yes its normal. Here where we winterize I suggest a mid-season cleaning and before winterizing the filter. If you are open year round I would recommend every 2-3 months, cleaning it as you did.
    Why would I need to do a mid-season cleaning? My pressure doesn't go up by more than 2.5 psi between open in May and close in September and the pool is crystal clear all season, thanks to BBB. Been that way for several years now. I just give it a good cleaning every fall close.
    Every pool is unique and not everyone is meticulous with maintenance - its just a general guideline and/or suggestion - not gospel. LOL
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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