So I'm building a basement sump and i want to incorparate 2 seperate tanks for doing water changes. I want to run these tanks inline with the system with only 1 at a time being used. So basicly i can mix fresh saltwater in 1 tank while the other is just a flow through within the system. When it's time for a water change all i have to do is turn a valve and it shuts off 1 tank and opens the other one. Then i drain that tank mix fresh saltwater and so forth. Has anyone done anything like this?