Love it. Uses 5cents (Australian) per litre. Need to give it a quick wipe clean after each use and a citric acid (included) clean every third or fourth time.
Makes 001ppm when using rainwater and 004ppm when using hard 235ppm tap water. If you put either of those back through for a second time it makes 000ppm. No taste, no smell, however it does make the water more acidic when tested with a PH test kit. No more than bottled mineral water though.
I use it in my coffee machine by adding 20ppm magnesium chloride and 55ppm sodium bicarbonate. By adding calcium chloride and potassium chloride in addition to the other two, you can make your own mineral water. I use it as 000ppm for distilled water for rinsing film in my darkroom.
It’s great quality and I’d buy another one of it ever dies, but it seems like it will go every day for years.