Compatible MICROLINE 435 R.O. Pre Post Filters w/ Membrane SET Set Includes: 1-Split Sediment / Carbon Pre Filter - pn# S7028 (pn # HYD-CB-5). 1-Granular Activated Carbon Post Filter - pn # S7025 (pn # HYD-GAC). 1- Microline 50 gpd TFC R.O. Membrane - pn # S1229RS. 1-(S7026W-JG) or Bi-Directional (IL-6W-C-38EZ) 6" In-line Chlorine Taste and Odor filter w/ 3/8" Quick Connect. 1st Stage Split Pre Filter Carbon Block / Sediment Pre Filter # S7028 (pn # HYD-CB-5) for use in all Microline TFC Reverse Osmosis Drinking Water Systems : TFC-25D , TFC-4, TFC-435 2nd Stage Activated Carbon Post filter for all Microline R.O. Systems # S7025 (pn # HYD-GAC) is used for a pre filter to improve the incoming feed water. Fits Microline R.O. Systems : TFC-25D , TFC-4, TFC-435 3rd Stage Reverse Osmosis TFC Membrane. This is the Original Clack Microline R.O. membrane with a 50 gallon per day rating. This membrane is effective usually at over 94% rejection of all total dissolved solids from your source water in the home. 4th Stage is the Activated Carbon Filter. This is a bullet style filter, and is used as the Post Filter or Polishing Filter. This filter utilizes 3/8" quick connect fittings on the inlet / outlet for easy removal and installation. This filter is bi-directional. Older Systems used 1/4" quick connections. Fits the Microline R.O. Systems : TFC-25D , TFC-4, TFC-435 Additional Details ------------------------------ Product description: Microline TFC-335 RO System Replacement Water Filter Kit S7028|S1229RS|S7025. Microline TFC-335 RO System Replacement Water Filter Kit provides a complete one year supply of filters for your TFC-335 reverse osmosis system. This kit includes all pre and post filters as well as the membrane. Kit includes: Qty. 1 - S7028 Compatible Sediment/Carbon Block Prefilter Qty. 1 - S1229RS TFC RO Membrane 35-50 gpd Qty. 1 - S7025 GAC Postfilter Note: Reverse osmosis membrane needs to be replaced every 2-3 years. Microline TFC-335