Here in New Mexico, the water is really harsh, full of minerals and all sorts of things that basically register 'way off the ZeroWater gauge for "normal." We rely on ZeroWater filters to provide us with water that doesn't just taste good but which is safer for consumption.
I have the 30 cup water dispenser and love it. My family and I go through a full dispense in a day. That said, I often run in to trouble with air blocks in the cartridge upon refill. It’s not the worst thing, but definitely an annoyance.
I love my Zero Water pitcher! I invested in the 12 pack of filters, as the price individually was a very good deal. I gave 6 filters to my mother and sister for Christmas this year, as well.