Philips AquaClean Calc and Water Filter CA6903/10 Remove limescale up to 5,000 cups* Each filter allows you to enjoy up to 625 cups of coffee*! Enjoy great-tasting coffee with AquaClean, an innovative water filtration system for cleaning your water. AquaClean filters the water to ensure that every cup of coffee has a rich aroma and full flavor from freshly ground beans, while reducing the need to descale your machine by preventing the buildup of limescale. Naturally removes calcium using ion-exchange technology, preventing your machine from clogging with micro-porous filter sheets. Easy to install and use. Easily activate the filter with the Click & Go system. Activating AquaClean disables the descaling alert.