Everytime I clean out my filter and turn it on, it pushes air into my CO2 reactor. It would gurgle for hours until the air is gone.
I finally added a tank valve at the top of the reactor. https://www.homedepot.com/p/Milton-I...E&gclsrc=aw.ds
I'd release the air pressure until a little water comes out. Problem solved.
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Gurgling PVC CO2 reactor 
Linear Mode
