Design - Zero Installation Purifier will look great in your kitchen. There are no leaky diverter valves or bulky hoses to attach to your faucet. Patented Technology - Pure water made simple. There is no need to waste your time waiting for the filtering process to complete. Fill up the bottom container with 1 gallon of tap water, push the button and walk away. In about 15 minutes the top container will be filled with 0.5 gallons of purified water and the unit will turn itself off. Top and bottom BPA-FREE containers can be easily removed and cleaned with dish soap. Water Purity - 4 stages of advanced filtration: Stage 1 is a five micron Sediment Filter. Stage 2 is Activated Carbon Block filter. Stage 3 is the heart of the reverse osmosis system, the RO Membrane. Stage 4 is an OnliPure Post Filter for absolute purity. This specialty Ion Exchange post-filter captures any leftover contaminants after the Reverse Osmosis process, bringing the TDS reading to zero. Zero Installation Purifier is designed to remove unpleasant taste and odor, chlorine, fluoride, arsenic, lead, chromium(-6), TDS - total dissolved solids, pharmaceuticals and many other contaminants commonly removed by a reverse osmosis water filter. Efficiency - Only uses 30W of power less than a lightbulb and has 50% (1:1) recovery rate - best among reverse osmosis filters. Easy To Change Replacement Filters - are available on amazon. The unit will notify you for the recommended filter change via red blinking light every 12 months.