<a href=showthread.php?s=&postid=15387362#post15387362 target=_blank>Originally posted</a> by NexDog
I'm probably a little thick but I can't follow the flow on that plumbing. Where is the in-pipe from the tank? Or is the system separate? I thought the idea was to run two tanks, one of which runs with the system and the other for mixing so you just flip a ball valve and flow goes from tank 1 to tank 2 with the new water. And Tank 1 can then be drained.
Maybe I'm thinking of someone else's system and not edandsandy's.
You're not thick at all...

There is no in pipe from the tank. This system only provides water to the tank (through a sump) for water changes and to the ATO reservoir for top off.
What the system allows is transfer and storage of RO/DI in the right side tank. When needed, I can turn a few valves and pump the RO/DI to the left side tank where it can be mixed with Reef Crystals and circulated until needed for my weekly water change. When I am ready to make the water change, I can turn a valve to drain 50G from the Rubbermaid sump, and then pump 50G of new saltwater from the left tank into that sump.
I have plumbed the drain level in the 100G Rubbermaid sump to allow approximately 50 gallons to flow to waste without any extra work. I put a nylon sleeve over the drain strainer so I don't lose any good critters in the sump. (I have several active Berghia Nudibranch colonies in this sump)
Results? A 10 minute water change with (hopefully) dry hands and dry floors...

LL
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