I am getting a new Cade 1800 S2 up and running. Things are going pretty well. I did have several slow leaks at various points in the plumbing. I have gotten everything to stop expect the main return down pipe still leaks a little right where two pipes screw together. See the water drop in the pic. It’s as tight as it will get by hand. Leaking is somewhat situational depending on how I adjust the return valve and how much pressure is in the pipe. What can I do to sure up this connection? The Cade plumbing was easy, but I don’t know how much I trust it yet. The connectors don’t get the seal as PVC cement gives that’s for sure.