Cartridges identical to those large areas but at Amazon rate. After many years of hard use without it because of the significant improvement in the taste of water. In addition the elimination of various products that can persist in drinking tap water is not negligible (heavy metals, nitrates, calcium etc ...) Perfect for hot drinks that find their true flavors, water drink (farewell bottle packs), water for cooking, the iron, the steamer ... A cartridge is provided for a month or so after 150 liters must not be deprived of the use during its lifetime. Imagine a filter content 3 carafes before consuming the water obtained and of course clean carafe with each filter change (hand soap or dishwasher without the digital counter) Simple product, convenient, efficient worth its cost even if preferred as cheap as possible.