Here‘s mine with ATO and AWC
I have my water change station in the basement. Automaticity keeps RODI full, automaticity tops off tank with the RODi, and I hit a switch and change 10% of the saltwater weekly. Pumps take old saltwater out and push saltwater up one floor to my living room.
Starts with 3 float switches in my sump that go downstairs to my basement controllers. First float switch (low) tells RODI or Saltwater to replenish depending on settings. 2nd float switch off. 3rd float switch is emergency off.
Have 2 controllers downstairs connected to float switches upstairs. When low float switch hits bottom, RODI starts pumping from first controller. Second controller manages RODI auto fill.
2 pumps downstairs manage pumping water to/from upstairs. Leave RODI connected to fill pump for auto top off. When changing water, switch to saltwater containers and turn on switch for drain pump. When 1st float value gets low, pumps up saltwater through auto top off. Pumps take out and replace saltwater at same pace. When done with saltwater change, turn off drain pump and wait till auto top off fills with rest of saltwater. Then switch auto top off back to RODI. Takes 10 minutes to change 10 gallons in my 90 gallon aquarium every week.