The medium-size 1500-liter Blue filter cartridge turns normal tap water into a premium table water. Any substances that might cause odor or taint its taste are removed by the 5-phase filtration technology. Even the smallest particles are extracted and the lime content is reduced, leaving pure great-tasting water for you to enjoy. Replacing the filter cartridge is super easy and hassle-free: Just unscrew the old cartridge, insert the new one, and you're ready to go.