At the moment i top off, with a measuring jug, and dump it in my sump when i get home from work, and before i go to bed with my B-Ionic, just haven't had the money to get my auto top-off sorted, i have a Kent Maxima 24gpd RO/DI, i would have to split it between my water change 50 gallon dustbin, and the sump for top-off, i might do it this week as have just ordered some new ro/di filters, depends how far away i'm dragged this easter weekend (sigh).
Will try to keep in mind the need forthe addition of reactors and the like. :D