They've been out of the $0.79 spring water for a long time at my supermarket. All they have is $1.79/gallon Poland Springs water. At either price an RO system would pay for itself in no time just for kitchen use. My tapwater is not bad (<150ppm), but I'm gonna get an RO system soon and stop buying spring water. I looked up the address on google maps where the cheap spring water comes from, and it's next door to a sewage treatment in NJ, along the same creek...So for you guys with the reverse osmosis systems - Do you feel they are beneficial enough to warrant the expense?