Do you have a pic of your set up so that I can copy.
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For what it's worth, here is my RODI setup for my 400g tank.
6 stage RODI. The hose hanging on it is used to fill up my Brute trash cans with wheels.
The RODI goes directly to my 50g reservoir which is on a shelf above my washer. It has an auto shutoff for when it gets full.
There is a 600 gph pump inside, controlled by a wall switch, to pump the water from the RODI storage container to the salt mix container.
Once the salt mix container is full, salt is added and there is another 600 gph pump inside the salt mix container, also controlled by a wall switch, to mix the salt.
When its time for a water change, I wheel the Brute on wheels to the mixing station, fill it up, and roll it to the tank. The line just inside the lip of the brute is 25 gallons. I have two of these. I siphon the first one using a 1" hose and fill it to the line. Then, with the second Brute with fresh saltwater already by the tank, I plug in the pump and pump the new water into the tank while I am emptying the freshly siphoned one out. I have timed it and I can do a 25g water change in 10 minutes, assuming no glass cleaning or other maintenance. I do water changes twice weekly, 25 gallons each time. And with it only taking 10 minutes, I can do it during a commercial break.
Saturdays are reserved for tank maintenance so I spend a little more time cleaning the tank then.