Well, it's kind of a pain to get out the purifier and run it for half an hour, then lug the bucket over to the tank. For daily top-off, it might be easier just to have a stock of gallon jugs in the cabinet. I don't know, I'm still working on a daily system that doesn't leave fish paraphenalia strewn all over the house.
Matt, I've tried a couple independent stores in the area, and I've been unhappy with them. So I'm going to the ***** in Peabody. The fish manager there has been the best combination of friendly, knowledgeable, and relatively inexpensive.
Dave
p.s. When I mentioned running the filter for half an hour, that's to get 5 gallons.