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Thread: Pentair Cartridge replacement time??

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    Pentair Cartridge replacement time??

    Good day:

    I have a Pentair cartridge filter which I think needs the cartridge replaced but wanted to get opinions. I have started to see the pressure go from 8-10 psi after a cleaning to about 16 in 4 days and 20 in a week.
    My water chemistry is as follows:
    Cl 3
    PH 7.5
    Alk 120
    Calcium about 120

    I've read on the forum here that one should be cleaning the cartridges once every few months.

    I usually clean as told in this forum. I take it out, put it in a bin with 1 cup dishwasher detergent and let it soak. A day later I rinse it out with a hose and nozzle.

    In the past I've made one error which may have contributed to my problem. I've added DE to the filter but I've done it maybe a few times only. I've had the filter about 3.5 years.

    Should I acid wash it?
    Should I bleach it?
    The pleats look good and are not damaged.

    Thank you

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    Re: Pentair Cartridge replacement time??

    Just by way of comparison my cartridges lasted 10 seasons before I replaced them. I did so because the plastic bands holding them together started to break down. My filter has 4 cartridges and can go a whole season without cleaning. It sounds as if your filter has one cartridge. It's possible that your filter may be too small for your pool and that any degradation , no matter how small, in the cartridges' performance can cause it to increase pressure in the system.

    I'd probably get a new cartridge, keep the old one as a spare.

    Tom
    In gound vinyl L, ~41,000 gallons, Pentair Clean and Clear Plus 420 cartridge filtter, Pentair 2 speed WhisperFlo pump

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    Re: Pentair Cartridge replacement time??

    I have a 9000 gallon fiberglass pool. I have 2 cartridges and alternate them between cleanings.
    Thank you Tom.

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    Re: Pentair Cartridge replacement time??

    You say have 2 cartridges and they alternate so you use one at a time correct? I have a 13k pool and have 4 cartridges.
    I was having the same symptoms as you. Clean filters and psi would be at 18. A day or two later it was back up around 28-30psi and my suction cleaner was not moving at all. I replaced them with new pleatco ones and my psi is around 8 and 4 if I open up the waterfall. Skimmer and cleaner working better then ever


    13k IG pebble pool w/waterfall, 1hp whisperflow pump, pentair ccp320 cartridge filter
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    JasonLion's Avatar
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    Re: Pentair Cartridge replacement time??

    You should rinse off the cartridges any time the filter pressure goes up 25% from the starting pressure. That may be every few days, or every few months, or as little as once a year, depending on the relative size of your pool and filter and how dirty the water gets. Frequency of cartridge cleaning is not an indication of the cartridge wearing out, it is an indication of the water being dirtier than normal.

    When the just cleaned pressure starts going up from what it was originally, you should soak the cartridges overnight in a detergent solution. When that fails to restore the starting pressure you should consider doing the detergent soak followed by an acid soak. If even that doesn't work, then it is time to replace the cartridge.

    Adding DE to a cartridge filter will permanently increase the starting pressure and cuts down on the lifetime of the cartridge.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Pentair Cartridge replacement time??

    I am acid washing it now. How long in the acid? I really need to clean it. Even though I wash it I noticed that way deep inside the pleasts, there was DE powder caked in!! I think I will take an hour and wash it pleat by pleat after the acid wash.

    I appreciate everyones input.

  7. Back To Top    #7
    JasonLion's Avatar
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    Re: Pentair Cartridge replacement time??

    Half an hour to an hour in acid should be more than enough.
    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: Pentair Cartridge replacement time??

    Are you fighting with any Algae or water clarity issues? I had all kind of pressure fluctuations in my DE filter during an algae bloom last year. You didn't mention about your CYA reading and I assume your test results are either from TF100 or K2006.
    13K gal, IG, Gunite pool with raised spa water spill over to pool, built on 2005
    1.5 HP Hayward MaxFlo VS - June 2014
    DE Filter Model # DE6020
    Added Borates on Jun 2014

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    Re: Pentair Cartridge replacement time??

    No; I have good clear water.
    Yes I have the k2006 kit.

    Thank you JasonLion

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    Re: Pentair Cartridge replacement time??

    A bit of a feedback: After the acid wash and only 3 hours soaking in dishwasher detergent, I rinsed it well and put it back into the filter. Upon start, my psi reading is 8. The last time it was 8 was when I purchased it new. Now I am acid washing the spare one; will let that soak in dishwasher detergent for 24 hours. If my pressure in current working one goes up to mid 10s by tomorrow, I will go ahead and purchase a new one.

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    Mod Squad jblizzle's Avatar
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    Re: Pentair Cartridge replacement time??

    So you think the water is clear, but I did not see you report a CYA number? Your FC is pretty low, do you have a CC number? (was that with the FAS-DPD test or a different chlorine test?) So unless your CYA is also low, you may have inadequate FC and an algae bloom starting and that is what is clogging your filter and causing the pressure to rise.

    BTW, we recommend cleaning filters when the pressure rises 20-25% over the clean pressure. So if you are starting at 8psi, you should be cleaning them at 10psi.
    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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    Re: Pentair Cartridge replacement time??

    Ok. I did some test moments ago.
    pH 7.2
    Free Cl 0.5
    Total Cl= 1.5

    CYA is 60


    Water is clear but as I look at it really carefully, not that clear. I need to be more careful. This got away from me.

    THANK YOU; I WILL add some bleach now and retest soon. It must be all the rain we had recently. Somehow the CL got away from me.

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    Mod Squad jblizzle's Avatar
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    Re: Pentair Cartridge replacement time??

    So your CC are 1.0 and your FC is 0.5? Or is your terminology not right?
    This just makes me more convinced you have an algae problem with the high CC and letting the FC drop below 5ppm (which is the minimum for your CYA according to the FC/CYA Chart).

    I think you filter is working fine and you need to follow the ShockLevelAndMAINTAIN Process.
    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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    Re: Pentair Cartridge replacement time??

    Yes. You are absolutely on the ball. I was ignorant in many ways not knowing that the filter can actually take care of the algae as well and that it can filter it besides particulate material.

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    Re: Pentair Cartridge replacement time??

    An update this am:
    pH=7.6
    Cl free=15
    Cl Total= 15
    Alk=140
    Calcium Hardness= 110

    If I am not wrong, I need to bring the shock chlorine level to 24 with my target @ 7 when things settle down??? No sign of green algae but water is not crystal clear yet (I know it takes time). Filter running all night and the psi gauge is reading 12 up from 8. I will clean filter to rid of algae as well.
    I'll wait for a response.

    Thank you

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    Smykowski's Avatar
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    Re: Pentair Cartridge replacement time??

    Don't forget about the "maintain" part. You may need to hold your FC at 24 for a couple of days. You only let it drift down to maintenance levels when all three criteria are met.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
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