My ro/di is in my basement, 4 levels down. lol more of a hassle to figure all that out vs just carrying some buckets
Carrying buckets up 4 stories doesnt sound like much fun either haha. Is there a sink on the third floor that you could bring a 1/4 hose out from when you fill the ATO then tuck back under when you're done? Or even have a 1/4" tube routed along the baseboard/under the carpet.