The Aqua Flo 41407005 is an ultra-fine filtration hollow fiber mechanical membrane featuring a quick change head for the QCUF RO system. The Aqua Flo 41407005 Ultra Filtration membrane replaces the fourth stage of the QCUF under-sink drinking water system. Rated at as a 0.2 micron membrane, the ultrafiltration (UF) membrane doesn't produce a rejection stream so no water is wasted. This means that a drain line is not required as with a typical RO system. The UF membrane features the same quick connect twist and lock design as the rest of the QCUF filters, making it easy to change out the membrane. Change the Aqua Flo 41407005 every 12 months to keep your RO filter system in top shape.