I'm looking for advice on two different problems I'm having getting my calcium reactor dialed in. The reactor is a Knop C being fed by an Aqualifter pump. The CO2 value is a brand-new single-stage Milwaukee with a solenoid and needle valve, connected to a 5# tank. The first problem is that I can't get a constant bubble rate from the CO2 valve. I've got 800 psi coming in and 20 psi going out. I'll set the bubble rate at about 20/min, but when I come back a couple of hours later, it's dropped off to 10/min or less. I can't find any kinks in the tubing, so I'm at a loss as to why the bubble rate won't stay constant.
The second problem is with the effluent drip rate from the reactor. There's no built-in effluent value on the Knop C, so I've tried a couple of different approaches. I first ran the effluent line through a simple ball valve, but fine adjustments were tricky, and the flow rate would drop off over time. I next tried a simple air line valve to the end of the line to control the drip rate. Same problem - the drip rate falls off over time.
Anybody have any suggestions for me (other than going back to dosing two-part)?