This water filter is really a worthwhile investment. Since I descale the Berliner tap water with this filter I drink a lot more water. I live on the fourth floor and water tanks hauling is for me not in question. This filter my dream of soft water has come true. The Berlin tap water tastes just as good now as the beautiful soft Austrian) The filter cartridge extend at least one month at a two-person household. We filter it every day around 5 liters. A really good product. The filter cartridges you get too often in various supermarkets on offer.
