I have a pressurized CO2 cylinder, the regulator, the solenoid, the needle valve, check valve, bubble counter, and then at the end of the line another check valve before it goes into the reactor. My problem is that whenever the gas goes off, the water from the bubble counter backs into the needle valve (through the check valve). Yes it is on right and I even changed it out to a new one. I am afraid to turn off the gas because of the water backing up. Any ideas on how to fix it?