<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...
![Smile :) :)](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png)
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...
![Smile :) :)](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png)
LL
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