I got mine set up pretty easy I guess. Sump in basement, display on first floor. Have a T off the return line. Shut off ATO. Open T that is plumbed to drain. Drain 5 or so gallons. (I don't even turn off return pump, Tank up stairs isn't disturbed) Shut drain valve. Have water mixing station all plumbed to recirculate. Open valve to move water from holding tank to sump. Close recirculation valve to force water from holding tank to sump. Fill to level on sump marked prior to emptying. Give water level a chance to stabilize in return section and top off as needed. Turn on ATO. No mess made.