Our house is split level and the top section where the tank (RSR 250) is, is on brick piers with a timber floor. The tank is only 7’ from the side wall. So I have setup my RODI station outside that wall with an 80L reservoir. In that reservoir is a PMUP and a Eheim CompactON 3000. In my spare room is a small furniture dolly with two barrels sitting on it.
The PMUP is plumbed through the floor and powered from the FMM in the tank sump to automatically fill the stock ATO daily (ATK). No more ATO top-ups for me!
The Eheim is powered from a switch inside next to the tank, and connected to a 1” water line through the floor sitting behind the tank, with an inline 1/4 turn valve. This is my in-house RODI supply. Turn on power, open valve, fill container, turn off valve, turn off power, turn on valve to empty supply line, turn valve back off.
When I do a water change I roll the dolly out of the nearby study over to the tank and fill my NSW barrel with RODI from the in-house supply (27L marked on the barrel). I then wheel it back, dump in salt, pop in a heater and power head and let it mix and come to temp.
When done (generally next morning) I wheel the dolly back over, turn on maintenance mode on the Apex and empty 27 litres of DT water into the waste barrel. I then connect a hose to the power head in the NSW barrel and pump that water into the sump. Halfway through I turn on my return pump, let it empty some from the sump and pause it (as I don’t like to overfill the sump even though it could take the full extra 27L). When the NSW barrel is full I turn everything back on in the tank and the return finishes filling it. Whilst this is happening I use the water in the waste barrel to clean my sponge and Poly Filter. At the end I empty the waste, rinse everything and wheel it away until next time.