We supply the filter housings in 3 different sizes. The 10 inch, 20 inch and the white ones for the PRF-RO systems. Pentek are world renown manufacturers of anything to do with water purification so you know you are buying a good honest reliable product. There are cheaper versions of these filter out there but you get what you pay for in our opinion. There is no reason why these filters housings shouldnt still be in good working conditions many years down the line.