Join Date: Apr 2007
Location: HI, but Pueblo, CO for now
The reason why you are only getting co2 to one ph is that the co2 will travel the path with least resistance. I bet it's going to the ph that has less tubing. To get thhe co2 to both ph's, you need to put a valve on the line that the co2 is already coming out of. Fine tune the total amount of co2 with your needle valve. Then use the other valve to get the distribution you want. Don't get those plastic valves, they leak. A metal gang valve may work but I'm not sure how leak proof they are.
The best, but not cheapest, solution is to run a manifold with 2 seperate lines and a nv on each. Then each line would go to a ph.