RODI setup talk

Now say I get a rodi unit... by tank is far from the sink how would this work? the unit would be under my sink does the unit run all the time or do I turn it on when I want to use it and topoff the tank that way? or is it a unit that I can hook up the water hose to run the water through it then into a bucket and then into my tank...


I know some of these questions may sound stupid but hey I can't be the only one wondering it