I am giving up on the regulator/needle valve that came with the system. For starters, it leaks. I have gone through two tanks in two weeks. I tried everything to find the leak. Spraying soapy water, re seating the seal on the tank/regulator, resealing fittings to no avail. In addition to that, I have the same problems that Dennis had. I get it set perfect and 5 hours later it has either stopped or has increased the count. You cant even look at it without it changing. I just ordered the electronic one from AP. I will update the thread when it arrives. If you are looking at a CA reactor, save yourself some money and headaches and get the regulator from AP.