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Thread: Cartridge filter pressure problems

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    Join Date
    Jun 2015
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    Mount Dora, Fl
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    Cartridge filter pressure problems

    I recently purchased a home with a concrete pool and a cartridge filter. I have owned homes with pools before but always vinyl liners and sand filters. Despite having a new cartridge filter I find my pressure rising to 30-35 psi each day and my water barely circulating. I have been giving the cartridge a thorough cleaning and the pressure drops down to about 10-15 psi but within a day or so its back up again. I have even put a filter bag on the skimmer to try and catch some of the dirt and debris without success. With a sand filter I would just backwash and go on but the cartridge issue is giving me fits. I am afraid I am going to ruin the cartridge with repeated cleanings. It generally doesn't look that terribly dirty when I remove it. What else could be causing the pressure issues? Thanks!

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    bobodaclown's Avatar
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    Apr 2011
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    Re: Cartridge filter pressure problems

    What's your FC/CC level. You may be on the verge of an algae bloom.
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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    Re: Cartridge filter pressure problems

    I do find it hard to keep the chlorine levels up since moving here. In Tn I used chlorine tabs as well as shock and stabilizer and didnt seem to have an issue but here it seems hard to keep those levels up with the warmer water temps. I have included liquid chlorine which I wasn't familiar with but that has made little difference. I am using a different brand of products here that I am accustomed to as well.Haven't had an algae break out yet but I know if I'm not vigilant it's going to happen. Any recommendations on what works best here in Fl.? Thanks so much!

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    bobodaclown's Avatar
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    Re: Cartridge filter pressure problems

    Liquid chlorine works fine. There are lots of pool stores that carry it year round.
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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    bobodaclown's Avatar
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    Re: Cartridge filter pressure problems

    Check out pool school and find our what your CYA level is at.
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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    South Park, PA
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    Re: Cartridge filter pressure problems

    After the chemistry is in check, if you feel that the cartridges are on need of replacement, I have had a good experience with Pleatco filter cartridges. Much better than the OEM cartridges.

    By all means, make sure something isn't growing first. If you haven't done so yet, get one of the recommended test kits and post a set of results. There are lots of experts on the forum that have great advice, but can't offer much without testing results. I switched to the TFP method this year and life couldn't be better pool side.


    30,000 gal inground (20 ft. x 40 ft. w/ deep end), vinyl liner, Pentair Clear & Clear 420 cartridge filter, single speed 1.5 HP Pentair Whisperflow pump, heat pump, SunTouch controller

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    Mod Squad pooldv's Avatar
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    Re: Cartridge filter pressure problems

    welcome to TFP!

    +1 on Pleatco cartridges, I like them much better than my OEM Pentair cartridges.

    But, rapid filter clogging is almost always an algae bloom. You can Perform the Overnight FC Loss Test (OCLT) to see if there is organic material/algae consuming chlorine in your pool. If so, then prepare to SLAM - Shock Level And Maintain your pool.
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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