I was starting to have problems keeping up w/ my cal also w/ a 2 part and that was when I decided to go ahead and make a reactor. I really don't have much money in it, I am borrowing the pump and the regulator/bottle. I think other then that the plastic cost me about $10 and the plumbing cost about $35-40 w/ all the JG fittings. It works like a champ, and now I have no problems w/ keeping up.