I get 40 gallons every 3 weeks or so, have tested it and has an extra decimal point LESS PPM solids than the self serve machines. I was used to water starting to foul in 2 weeks, but this water is still fresh and oderlwss 8 weeks later. They not only fill, but high pressure rinse each bottle before filling...and they do NOT let you self-serve, they are very particular about the potential unsanitary aspects of a client touching their dispensing equipment. They have rolling carts to get the heavy full bottles to your vehicle. After 2, an extra person usually working, faster service if you have multiple bottles...