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Thread: Questions on o-ring quality & lubricating o-ring

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    Questions on o-ring quality & lubricating o-ring

    Hello everybody,

    I inherited a Pentair Clean & Clear Plus cartridge filter from the previous owners along with the pool. Recently, when I opened the filter to clean it, I noticed that the o-ring between the top and bottom shell was a bit streched out. Is that how it is supposed to be or should it have a snug fit around the filter (where it sits)?

    While looking around on the web, I vaguely remember reading somewhere that I should not lubricate that particular o-ring. I am not certain but I think the website was talking about the same o-ring. Am I not supposed to lubricate the o-ring before assembling the filter back? If not, why?

    Lastly, I am noticing that the filter is catching things much bigger than what it is supposed to (leaves, small branches, etc.) My guess is that those things get by when I am removing the strainer basket to clean it. Is there anything I can/should to prevent these things (things that are supposed to be caught by the pool strainer basket) from showing up in my cartridge filters?

    Thanks in advance.
    Pool Type: Outdoor
    Pool Capacity: 20,000 Gal
    Pool Surface: Gunite/Plaster
    Filter Type: Cartridge
    Typical Weather: Hot & Humid

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    duraleigh's Avatar
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    Re: Questions on o-ring quality & lubricating o-ring

    Welcome to the forum.
    My guess is that those things get by when I am removing the strainer basket to clean it.
    Don't the skimmer baskets catch the twigs? They should never reach your pump strainer basket and, if they do, I don't see how it is possible for them to get by the pump strainer basket.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Richard320's Avatar
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    Re: Questions on o-ring quality & lubricating o-ring

    As far as I know, O-rings always get lubricated, on anything. The way they seal is by getting smashed and deformed. If they aren't able to slide around a little as they deform, they may not deform evenly.

    You probably read not to lubricate them with petroleum based lubricants - that would be WD40, Vaseline, 3-in-1 oil, common stuff you already have. You want silicone based lubricant.
    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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    Qwaxalot's Avatar
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    Jun 2012
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    Re: Questions on o-ring quality & lubricating o-ring

    Quote Originally Posted by newowner77077
    Hello everybody,

    I inherited a Pentair Clean & Clear Plus cartridge filter from the previous owners along with the pool. Recently, when I opened the filter to clean it, I noticed that the o-ring between the top and bottom shell was a bit streched out. Is that how it is supposed to be or should it have a snug fit around the filter (where it sits)?

    While looking around on the web, I vaguely remember reading somewhere that I should not lubricate that particular o-ring. I am not certain but I think the website was talking about the same o-ring. Am I not supposed to lubricate the o-ring before assembling the filter back? If not, why?

    Lastly, I am noticing that the filter is catching things much bigger than what it is supposed to (leaves, small branches, etc.) My guess is that those things get by when I am removing the strainer basket to clean it. Is there anything I can/should to prevent these things (things that are supposed to be caught by the pool strainer basket) from showing up in my cartridge filters?

    Thanks in advance.
    If the O-ring is a little loose you can shrink it by putting it in a bucket of ice water before reinstalling it. You can also cut a little piece out of the o-ring and super glue the ends together. You can also buy a new o-ring.

    Yes, you should lubricate the o-ring lightly (with silicone lube, as has been said) before reinstalling it.

    And, lastly, if you're getting large debris in the filter, check the pump basket, it's likely split.
    In the industry, CSP (Certified Service Professional) by the NSPI and it's successor the APSP. My company services over 600 pools every year. I think the practices regularly espoused on this forum (especially the BBB method) are outstanding; however my comments will be often oriented towards the goal of getting it done, and getting it done right now!

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    Re: Questions on o-ring quality & lubricating o-ring

    Thank you all.

    Qwaxalot,

    I like the idea of putting the o-ring in a bucket of ice water before reinstalling the filter. If that doesn't work, I will proabably get a new o-ring. I am not very comfortable with the idea of putting it together with super glue. I am afraid it might come apart while tighting the filter clamp. I just checked the pump basket and its seems to be in good shape. Thanks for the good tips.
    Pool Type: Outdoor
    Pool Capacity: 20,000 Gal
    Pool Surface: Gunite/Plaster
    Filter Type: Cartridge
    Typical Weather: Hot & Humid

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