Hey Team, I have a 2 membrane RO that I built for my little operation. I have plastic tubing but a brass needle valve on the concentrate line to provide back pressure. I have a hard time getting that to seal up properly. My thought is that the brass (or copper to be honest I'm not real sure) compression bushing wont properly seat against the plastic tubing. I've seen on youtube it looks like some people are just using a quick connect ball valve on their output line. Can anyone confirm or deny that? It just BARLEY drips but I hate having a leak, even a small one.
Thanks