Brondell H2O+ Coral UC300 Three-Stage Undercounter Water Filtration System – Water Purifier with Designer Chrome Faucet – Quick Change Filter, WQA Gold Seal-CertifiedTHREE STAGE FILTRATION: Brondells Coral Three Stage filter set consists of a sediment filter, pre carbon filter, and carbon block filter. Get rid of physical, chemical, and biological contaminants in your water while leaving behind beneficial minerals. QUICK FILTER CHANGE: The Coral features a Twist & Seal system that makes changing the water filter a breeze while two "quick connect" hose connections make installing the Coral fast and easy. HIGH