Check the listing for details. 3pcs replacement filter set for portable Reverse Osmosis Systems with KDF filter. Condition: New. Listed at 29.99 USD. 1 Universal Set (3 filters) for 4-stage Reverse Osmosis Systems, made in USA OVERVIEW: Brand New. Total filters: 3 1-st stage: Inline Sediment Filter 2"x10" 5 Micron, Made in Taiwan. 2-nd stage: Inline Granular Activated Carbon T28 Carbon Pre-Filter 2"x10", NSF Certified, made in USA. Membrane (not include in package - change every 2-3 years). 3-rd stage: Inline Omnipure Granular Activated Carbon T33 with 1/2 lbs KDF-55 media, 2"x10", NSF Certified, made in USA. Specification: Type 5M Sediment Purpose: Remove sand, silt, dirt and rust particles Diameter 2" Fitting 1/4" female Service life 2.500 Gal Length 10" Stage First Housing Clear SKU IL-10SC-S514 Type: T28 GAC pre-filter Purrpose: Remove chlorine, chloromine, aluminum, cyanide, nitrates, cysts, pesticides, VOC. Also improve test and water color & odor reduction Diameter 2" Fitting 1/4" female Service life 1.500 Gal or 6-8 months Length: 10" Stage Sedond Housing White Man. SKU CL10ROT28 Carbon Type T28 , Standard Coconut Shell GAC Type: KDF-55 / T33 Purpose: to remove more effectively heavy metals (copper, lead, mercury and etc), ammonia and control microorganisms/bacteria Diameter 2" Fitting 1/4" female Service life 1500 gallons or 8-12 months Length: 10" Stage Last or before T33 post filter Housing White Man. SKU K2567-BB Type oxidation reduction process and regular carbon treatment Shipping (USA): We ship within 1 business days via USPS Priority Mail. Shipping (International): We ship within 2 business days via USPS International First Class Mail. Returns/Exchange: Within 15 days. Filters must be never used, and be in original sealed package. Warranty: Warranty: 30 days