1. In the second picture, I have where I showed two drains with a gate on each one. This is the plan. I am not gluing these connections as of yet. I may very well just go back to the standard fittings. I am not modifying the overflow at all. My idea, albeit probably a dumb one, is to slow the flow of the drains to prevent the soft toilet drain sound. The return pump area is so small and the way the sump is designed, I should be able to run the return section dry and not overflow the tank if the drains back up for any reason. I am going to run several tests during the cycle to test in action. My hope is the shut off on the pump would come on if it ran dry. I am really just playing with it at this point. None of this might work. But as you know, the silicon-ed drains are a PITA!
2. I found the return pump inlet screen at BRS. 3d Printed inlet screen
3. Only one return which tees at top of overflow. 3/4" in overflow box, but I modified to be 1" return to the bulkhead and reduced from there. So not counting on a ton of flow from return pump. Probably will end up adding a couple more MP40s for flow.
Thank you on the plumbing control board! This site is great for ideas!
Forgot to post a FTS for now.
Thanks. I have the piping and valves to do this but haven't pulled the trigger. Let us know how it goes.