bubbles out of one of my returns

A byproduct of the SWG process is hydrogen which usually will come out of the returns closest to the SWG but not always

It comes and goes as the SWG is turning on and off for your schedule
 
in theory

Air leak = consistent bubbles if pump is on
SWG = bubbles when your cell is operating

So next time you see them look to see if your cell is on 🤷‍♂️
 
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