BEST-IN-CLASS TECH: Clarifi Pre-Filter minimizes system clogging and enhances efficiency. FILTER CHANGE ALERTS: Indicator lights and audible alerts help you track filter life and know when a filter needs to be changed. EASY, DIY MAINTENANCE: Carbon and RO filters and optional remineralizer cartridge have a two-year lifespan so you can replace them at the same time quickly and easily - it takes less than a minute to replace each. MULTI-STAGE FILTRATION: System provides 6 filtration stages using 3 included cartridges, the Pre-Filter, Reverse Osmosis Filter and Carbon Filter. Optional 7th stage uses a Clarifi Remineralizer Cartridge to replace taste-enhancing minerals removed during the normal RO process VIDEO TUTORIALS: Find more information in the included user guide, M&I, and Delta Faucet’s YouTube. LIVE CUSTOMER SUPPORT: Backed by Delta Faucet's warranty and highly-trained, live customer support