Bubbles in returns after dumping water


Bronze Supporter
Feb 27, 2018
Savannah, GA
I have had to lower pool water level due to rain a few times lately, by pumping to waste. When I turn the filter valve back to circulate I get about 10-15 seconds of air bubbles from the returns. Does this indicate a possible leak in the return line or is it normal?

Rancho Cost-a-Lotta

Silver Supporter
Apr 10, 2018
Rancho Cucamonga, CA
Your filter is probably losing water during the process. You should have an air bleeder valve on your filter that you can open up after switching your valves back to pool return. When a steady stream of water comes out of the bleeder, close it back up.


Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
In The Industry
Apr 1, 2007
Sebring, Florida
If it's gone in 10-15 seconds, I wouldn't dwell on it. It's coming from somewhere on the suction side and could be the pump basket lid taking just a few seconds of run time to properly seal. Personally, I wouldn't chase it unless it becomes worse.