Microline Clack S1229RS Reverse Osmosis Membrane capacity is 50 Gallons Per Day. The Microline Clack S1229-RS RO Membrane is not chlorine resistant. A carbon filter must be used before the Microline TFC-50 membrane. The Microline Clack S1229RS RO Membrane is also known as the TFC-50. The Microline Clack S1229RS can be used in the Microline TFC-335 RO System and Microline TFC-435 RO System and can replace the Microline S1227RS membrane.