Specs: Geo CR818 with Geo secondary chamber Reborn calcium reactor media Carbon doser CO2 regulator(about 12lbs. pressure and about 1 bubble every 6 seconds) Kamoer perastalic feed pump(pushing not pulling per your recommendation several months back) I have had this setup running for about 7-8 months. I have taken the unit completely apart and lubed all o-rings with silicone grease/lube. I have adjusted the CO2 pressure up and down to no avail. I did find some bubbles coming in the Kamoer feed line from the sump but have since corrected that so no no more air bubbles coming from sump. Every 2-3 days I find myself having to turn off the reactor and bleed the air out through the effluent line going to the secondary chamber. It is getting old having to bleed the air out every 2-3 days. I am at a loss and tired of doing this. Note: Each time I bleed the "air" out I noticed alot of bubbles that accumulate in the reactor media. I shake the unit each time to dislodge the air trapped so I can bleed it out. I say "air" as I am unsure if it is actually CO2 or ambient room air. Please, please provide some other insight as to how to correct this problem. Could the reactor media be too small and trapping CO2? Is this the proper size media for this reactor? Also worth noting...when I disassembled the unit, it seemed the connecttion/o-ring on the shroud for the Sicce recirc pump was a little loose. Would it be worth trying a new pump? Please advise. Thank you.