USFilter produced multi-stage water filtration systems before being acquired by Pentek. The four stage USFilter RO 1440 and the three stage USFilter RO 1430 use quick and easy to change filters and membranes. We offer replacement water filters for your USFilter system, including the sediment filter, the carbon block post filter, and a TFC RO membrane. Do you need assistance selecting the right filter or membrane for your USFilter system? Contact our helpful customer service agents, who would be happy to help you.