big air bubble in pump basket

Frank in FL

Well-known member
Jul 3, 2019
189
Florida
What would cause a big air bubble in my pump basket? There is no bubble when pump is at 3400 rpms. But when the pump is at 2000 rpms after about an hour or two a huge bubble forms in the lid. It just recently started getting cooler here in Florida, but Ive never had this issue before.
I cant post a video, but here is a screen shot of it
 

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Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Variable speed pumps often develop a small bit of air when on lower RPMs for a while which is why kicking them up in RPM once or twice a day helps to purge some air. But you state this just started happening. So the first reaction to air in the pump basket might be looking for any areas where air might get pulled-in on the suction side. Since your weather has been cooler, you might check the lid O-ring to ensure it's lubed well. Also make sure the water level in the pool is good and that the skimmer weir door is operating smoothly. As a last thought, make sure your cartridge filter hasn't gotten too dirty. When that happens, it can impede good water flow and cause a bit of a backlog in the pump basket. Happens to me every time.
 
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Jimrahbe

Mod Squad
TFP Expert
LifeTime Supporter
Jul 7, 2014
14,655
Bedford, TX
Frank,

Pretty normal for there to be a small bubble or two a low RPMs.. If you have one at 2K, I would assume you have a very small suction side air leak. Most likely right at the pump lid O-Ring.. Lube it up and try it again..

There was also some discussion about the bubble being larger than normal is an indication about how dirty the filter is.. Not sure how true that is, but if it has been a while since you cleaned your filter, you might want to clean it and then report back if it had any effect the the size of the bubble.

Thanks,

Jim R.

Thanks,
 
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Frank in FL

Well-known member
Jul 3, 2019
189
Florida
Thanks fellas!
Ill check the filter tomorrow and goop up the lid seal. My filter psi has gone up by about 4 psi since it was cleaned about 2 months ago. Weir door is working as it should. Water level is good. not alot of debris in skimmer.
Ill report back with findings.