Microline 25 Gallon-Per-Day "Revised Seal" Membrane S1227RS. OEM membrane for Microline systems. This membrane is capable of producing 25 gallons of purified water in 24 hours. Comes packed in antiseptic wrapper. This is a TFC membrane. A S7028 pre-filter should be used if your water contains chlorine. Designed for use in all Microline reverse osmosis systems. Includes shipping fees!