Yes, I can sympathize with your situation. I have built several Cerges reactors (along with many other plumbing projects) and have had to deal with leaks every so often.
Couple of questions - does your whole house filter have some type of purge valve on the top (most do)? With my latest version it has a twist top that when turned far enough it vents out air. Others just have a button. This would help get the air out of your system during startup. Having a ball valve on each end of the reactor does help with maintenance and tuning, assuming you have the room for it.
Can you post a picture of your setup? I might be able to offer more advice. Also, for what its worth, it should be worth it in the end! These reactors, when properly built are extremely efficient at dissolving co2 into water.
FYI, this is my setup.
Couple of questions - does your whole house filter have some type of purge valve on the top (most do)? With my latest version it has a twist top that when turned far enough it vents out air. Others just have a button. This would help get the air out of your system during startup. Having a ball valve on each end of the reactor does help with maintenance and tuning, assuming you have the room for it.
Can you post a picture of your setup? I might be able to offer more advice. Also, for what its worth, it should be worth it in the end! These reactors, when properly built are extremely efficient at dissolving co2 into water.
FYI, this is my setup.

