FREE Shipping! TFC for EWS Four-Stage & Five-Stage Reverse Osmosis System (RU400T35 and RU500T35 models) Item No.: RO-M-TFC Description: TFC membrane Replacement Schedule: Up to 1 year, not to exceed 1 year Special Note: EWS uses full-size, full bed depth, medical-grade filters for optimum performance and longer life   Handmade in the USA from USA-Made Parts