Set includes 2 water filters designed to be used with Philips, PicoBaristo, and Incanto espresso machines (sold separately) Ion-exchange technology removes calcium from water to prevent the formation of taste-affecting limescale in your appliance Micro-porous filter features patented water flow for optimal purification to preserve the taste of authentic coffee Requires timely filter replacement for every 625 brews to avoid the need of descaling for up to 5,000 cups (additional filters sold separately)