Water bubble builds in pump skimmer until hardly no return pressure


New member
Jun 2, 2021
Brooklyn NY
Please help!!! The pool guy said it was normal but it doesn’t look normal at all. As soon as it’s on it works great and pressure is good for about 15 minutes. Then slowly air bubbles start to form inside the pump skimmer until it becomes one big air bubble and no water movement in the pump skimmer. And returns are down to almost no pressure. I backwashed and changed a few o-rings. I have a new DE filter just purchased last season. Any tips please?


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Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
Laughlin, NV
Pool Size
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Welcome to the forum!
Does your filter have a MPV? If so, place in Recirculate and see if the issue goes away, if it does, the filter is plugged with debris.
Can you post a full set of water chemistry results from your own test kit?
I suggest you read ABC's of Pool Water Chemistry.


Bronze Supporter
Jul 22, 2020
My former Hayward Super Pump did the same thing to me last year. I replaced the gasket on the cover and ended up rebuilding it with completely new gasket set and ceramic bearing seal from Amazon. Things got better but still weren’t perfect, as suggested above the grids on my filter were clogged. I also discovered I had a plastic ball valve on the return that was partially stuck closed so my flow was restricted.

I found that gasket in the square lid to be a royal PITA. It never seemed to seal up very well and one of things I discovered early on was that one of the knobs that holds it down was stripped. I ordered a new knob and barrel nut off of eBay (cheap).
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