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I own this unit for a month. It works great, and I live in the desert with hard to believe amounts of calcium in the water (TDS 1350). Using the filtered water from this unit, my electric water pot still has a mirror finish after a month, and it always has water sitting in it. Prior to buying this unit, it would be caked all over with white calcium. My espresso machine would need constant decalcifying too. No more.
This unit also holds 1.33 gallon in the main tank, and you get a gallon of pure water from that. Very little wast water, and twice the capacity of other popular countertop units. The two replacement filters, which are supposed to last 1 (PPC filter$ 30) and 2 years (RO filter $ 40) are cheaper than most. I use it everyday. It’s totally automatic. Take off pitcher (comes with 2) and it stops. Main tank empty, it stops. Replace pitcher with refilled main tank, it starts again. Dispenses water too, in a glass or my coffee pot in the morning. Very cool appliance that has served my needs.