Whats the capacity on that thing? I don't see how it could be worth it to run anything less than a 5gallon boiler.. The smaller your still, the less energy efficient it would be, and you're looking at almost a kwh/litre best case scenario already.. If I was using that thing to fill up a res, then I'd have to run it 24/7 to keep up with demand.. But honestly I'm not that fussy about my plant water.. I know my water is decent, only seedlings got anything special.. I'd dechlorinate sometimes, sometimes not (kind of a loose cycle, dechlorinating more as the end became near)..