Here at last is a TRUE Thin Film Composite (TFC) reverse osmosis membrane from AquaFX. Extensive testing has demonstrated that DOW's TFC sheets are the best material for membrane applications. That is why AquaFX ONLY uses this material for all Aqua Engineering & Equipment membranes. This membrane will fit any standard RO membrane housing, so you can "upgrade" to an Aqua Engineering & Equipment RO membrane. Superior membranes = superior performance. Suitable for use with 50GPD systems.