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CULLIGAN AquaCleer AC-30 Replacement Pre & Post Filters w/ Membrane SET Replacement Split Carbon Pre and Post Filters AND TFM-36-A Membrane for Culligan AC-30 RO Systems TST Carbon Blocks use high activity Coconut Shell powders, Advanced Binder Technology, and a unique compression molding process resulting in industry leading performance and contaminant reduction capabilities. What you get : ( 1 ) Replacement Culligan AquaCleer 5 micron Sediment Pre Filter ( 1 ) Culligan compatible TFM-36-A 36 Gallons per Day TFC Membrane ( 1 ) Replacement Culligan AquaCleer Split Block Carbon Pre Membrane Filter ( 1 ) In-Line Carbon Post Polishing Filter w/ 3/8" in and out Quick Connect Fittings Product Features: Coconut Shell Granulated Activated Carbon (GAC) Advanced Binder Technology Unique Compression Molded Process Chlorine Capacity: 3,000 gallons @ 0.50 gpm Replace Every 6 Months or as needed