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Thread: stuff on INSIDE of cartridge filter??

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    Join Date
    May 2009
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    Austin, Texas
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    46

    stuff on INSIDE of cartridge filter??

    After thoroughly cleaning my cartridges as per instructions here, I'm seeing some dark stuff INSIDE (on the other side of the "paper") of my otherwise white cartridge filters. If I spray it directly from the outside, it will usually shift downward (as whole small "pieces") in the pleats. What is this? Is it harmless to put my cartridges back in to the filter with this stuff?
    Mike
    25k IG w/ Pebble Sheen
    + 8' diameter spa w/spillway
    Hayward ProLogic + T-CELL-15 SWCG
    Cartridge Filter

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    In the Industry

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    Nov 2010
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    Re: stuff on INSIDE of cartridge filter??

    If you're seeing the debris accumulate on the inside of the cartridges, rather than on the outside - the filter is plumbed backwards. You should always see a greater accumulation on the outside of the cartridges. The normal water flow introduces the water on the outside of the cartridges, so it passes thru the fabric to the inside then back to your pool. It's possible you're seeing some algae accumulation, but you should definitely see a greater accumulation of the same stuff on the outside. Check the owner's manual for the filter to see which is the inlet port. The pipe that comes out of the top of the pump should go directly to the filter port labeled INLET.
    APSP CST Certified
    17k inground concrete; 1.5hp 2 speed Tristar pump, 300sq.ft. Cartridge filter, AquaLogic PS-4 w/ Tcell-15, Navigator suction cleaner.

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    May 2009
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    Austin, Texas
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    Re: stuff on INSIDE of cartridge filter??

    No, it is not plumbed incorrectly--there was definitely more stuff on the outside. But like I said, AFTER cleaning the outsides thoroughly I can see some dark stuff on the inside. It does move/shift if sprayed/agitated. Any ideas what that might be and what I should or should not do? Thank you.
    Mike
    25k IG w/ Pebble Sheen
    + 8' diameter spa w/spillway
    Hayward ProLogic + T-CELL-15 SWCG
    Cartridge Filter

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    Melt In The Sun's Avatar
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    Oct 2009
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    Tucson, AZ
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    Re: stuff on INSIDE of cartridge filter??

    My guess is that it's some stuff that is small enough to get blasted through the carts when you're cleaning them. I wouldn't worry about it.
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
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