Did you know your RO Membrane is the most expensive part of your pure water system? In a Multi Stage System, for example, the RO Membrane's job is to lower your TDS to a level that will extend the life of your DI Resin. Carbon Sediment Filters, on the other hand, protect the RO from chlorine and sediment. We carry RO Membranes for every purification system should you need to replace it. These membranes come from top brands and fit in XERO, Tucker, and other systems. We carry an entire selection of Replacement Filters for your purification system.