George, hook me up with a more precise measurement from the return pump to the height of the return inside the tank. Not sure if the 10' height is to the ceiling in the basement, to the floor behind the tank or to the return within the tank. Knowing this will help determine pump capacity.
I'm a bit confused by the salt mix feeding into your RO/DI ATO. I hope you're not going to top off with saltwater. Explain that a bit more for me too.
'Back flow preventer' aka check valve is not customarily used in saltwater applications. They tend to stick or freeze over time. This is primarily due to calcification (salt build up). As long as you have your return outlet high in your display tank, and your overflow high in the display then the most water that can siphon out is the amount of water above those two bulkheads within your display. Just leave enough vacant capacity inside your sump to handle the overflow from your display (in other words, just increase the size of your sump to allow for approximately 8" of water in it (for the skimmer operation) and the rest just air space for power outage backflow). Hope that was clear :banghead:
You didn't label any ball valves on your diagram. You'll want to have one for each of your phosban/carbon reactors, your chiller, the fuge and your return. Don't forget to use unions. No ball valve or restriction on the overflow to the sump.
Not sure what size the overflow is on your 155 bow. If you could find that out it'll help to configure the size of the plumbing and also the return pump noted above.
HTH,
Russ
