Dose anyone know anything about these? http://www.frugalsquirrels.com/cgi-...n=PROD&Store_Code=FSOS&Product_Code=SGBBSBPWB Has anyone here used them? I know I have heard a lot of good things about the big berkeys but have not heard much about these. what I basicly wanted to find out is do they filter as well as the big ones, if not then what do you have to be sure is not in the water or to treat for and how much water are they capable of filtering in a given time? Also how much water can they filter before haveing the filter changed and how durable are they? Do the filters have a shelf life? Any info I can get on these would be helpful since this would actualy be in my price range to pick up a couple of these if they would meet needs here (or getting to here) for drinking water, and I tend to need abnormaly large amounts of water as in hot weather and working I often need 5+ gallon of water a day to stay hydrated.