While I wait on the gasket, I will work on the return lines. Here is a tentative layout for the plumbing right after the return pump. It will be connected via some flexible tubing to reduce vibrations. I will have a reactor plumbed off the right side, and the ball valve to the left is so that I can disassemble & clean the check valve without allowing all the water from the main tank back down into my sump. I suspect the sump will have some issues handling the siphoned water so I included a George Fisher Wye check valve. My thought was to include just one valve, even though the pipe will branch into two return lines. The thinking is that a single valve (that I clean regularly) would be better safety than having two in place (double chance of failure). I have seen many people add them right below where the return lines enter the tank. Anyone see any issues to my reasoning here?
Plumbing return pump by
choerenz, on Flickr