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Pool Filter Lid "Pops" when Pump Kicks In

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Pool Filter Lid "Pops" when Pump Kicks In

Old 06-14-2019, 10:21 AM
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Default Pool Filter Lid "Pops" when Pump Kicks In

Our pool filter had a pin-hhole leak in the base so last weekend I installed a new one. I've noticed when the pump kicks in the filter's lid lifts up a few millimeters with an audible pop. Other than that it works fine but my wife is nervous (pics in the "Best picture.." thread). The old one was 20-ish years old so I can't really say what is "normal", is this something to worry about?
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Old 06-14-2019, 10:42 AM
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Pressure, Filter lid nothing to play with.
Do you have a single/dual/ or variable speed pump?
pressures on a variable speed pump at a low RPM is much less of a risk but still you have something I think that needs possible addressing.
I have a DE filter and it does not do movement. sure you have it tight? Did you clean and replace the old gasket?
If you have something 20 years old, it could have stretched ever so minutely to the point that there is now a size mismatch.

troublefreepool.com is your best place for pool info Once you post the make/model of filter, peeps will post up their opinion.
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Old 06-14-2019, 10:56 AM
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It's a single speed pump, I replaced the 20 year-old unit with a new setup; housing, gasket, filter, gauge, etc.
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Old 06-14-2019, 11:03 AM
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It should seal tightly to the cylinder. If it moves something is worn or broken. It could be as simple as the o-ring is worn out and flat.
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Old 06-14-2019, 11:18 AM
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Wonder if the oring is no good, one we have on the new basket seals nice and tight. Had the same issue, crack in the old skimmer, sealed that up, popped a new basket in seals fine.
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Old 06-14-2019, 11:47 AM
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No worries mine squirts a little water out when pump kicks on has done this for years. Pool is 40 years old and on my second pump
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Old 06-14-2019, 12:27 PM
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The o-ring looks good, feels pretty snug when I press the lid on. I press the lid into place, screw the locking ring as far as it goes, and it looks right but when the pump kicks in it lift up a tiny bit. I'd be concerned if water squirted but it's just a little "pop" and everything's good.
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Old 06-14-2019, 02:45 PM
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make sure you use that special lube on the orings for the proper seal. I used to have leaks all the time until I used it. Now none..
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Old 06-14-2019, 03:24 PM
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What brand/size is the filter . Certain brands will do that and it is normal others - not good .
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Old 06-14-2019, 03:59 PM
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If it doesn't leak after the pump gets running, don't worry. Bigger fish to fry.
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Old 06-15-2019, 06:29 AM
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Originally Posted by JDinSWFL View Post
What brand/size is the filter . Certain brands will do that and it is normal others - not good .
Not the cheapest on Amazon, but the cheapest that didn't look like a Tonka toy. The brand is SUNSOLAR
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Old 06-15-2019, 06:33 AM
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When you put the lid on, PUSH it down hard. You should hear a snap and a vacuum seal sound.
Then crank the locking ring down.
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Old 06-15-2019, 08:30 AM
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Completely normal. Mine has done that for 15 years....
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Old 06-15-2019, 11:08 AM
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That type of filter, it is fine to hear a pop. Just make sure that the locking ring is properly seated. I have been building pools for over 30 years and have seen every different type of filter and that type will work fine .
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Old 06-15-2019, 02:49 PM
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Trapped air in the tank maybe? Do you bleed the air out or let it get forced out? Is there an air relief tube inside? Asking for a friend
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Old 06-16-2019, 06:58 AM
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Originally Posted by Mine Now View Post
Trapped air in the tank maybe? Do you bleed the air out or let it get forced out? Is there an air relief tube inside? Asking for a friend
I'll look into that, the bleed valve on this one needs a wrench or screwdriver where the old one had a knob.
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Old 06-16-2019, 08:52 AM
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Originally Posted by Craash420 View Post
I'll look into that, the bleed valve on this one needs a wrench or screwdriver where the old one had a knob.

After the prime it becomes more suction. Sometimes the lid will leak a little water. Don't tighten the lid to much
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Old 06-16-2019, 09:09 AM
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Originally Posted by Craash420 View Post
The o-ring looks good, feels pretty snug when I press the lid on. I press the lid into place, screw the locking ring as far as it goes, and it looks right but when the pump kicks in it lift up a tiny bit. I'd be concerned if water squirted but it's just a little "pop" and everything's good.
Is there a stop for the locking ring or are you just making it tight? I had a cartridge filter "customers" where the lock ring would get tight but wasn't actually all the way on. Filter popped when I turned it on.

Edit: I think I know what the problem is. Make sure the lid is seated all the way into the lock ring, there might be a notch which is suppose to keep the lid and the ring from separating if the lid isn't seated in that ring it will pop " get pushed up" until the lid is moved into the correct position.

Last edited by Mine Now; 06-16-2019 at 09:35 AM.
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