Get your Watts Premier WQCHFC11 Reverse Osmosis Membrane Filter is designed for the Watts Kwik-Change reverse osmosis drinking water system. This WQCHFC11 uses the special Hollow Fiber (UF) water filter technology, which helps maintain the quality of your water for up to six months. Inside the membrane, there is a 0.1 – 0.3 micron Hollow Fiber. This allows for ultra filtration ensuring you always have the best tasting drinking water possible. Installs easily with a quarter turn and a patented push valve allows you to replace these filters without turning off your water.