Check the listing for details. 4pcs replacement filter set for portable Reverse Osmosis with KDF-55 & Calcite. Condition: New. Listed at 49.99 USD. {Title} My Aqua Filter 1 Universal Set (4 inline filters) for 5-stage Reverse Osmosis Systems, made in USA with Calcite (raise PH from 7 to 9) and Super KDF-55 Filters Item Description Total filters: 4 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). 4-th stage: Inline Omnipure Granular Activated Carbon T33 with 1/2 lbs KDF-55 media, 2"x10", NSF Certified, made in USA. 5-th stage: Inline K2548BB Omnipure Calcite (Acid Neutralization - pH raise) filter, 2"x10", NSF Certified. Increases pH level from 6-7 pH to 8-9.5 pH. Premium US made KDF/T33 post filter: to remove more effectively heavy metals, ammonia and control microorganisms/bacteria. You can read about KDF filtration process here: https://www.kdfft.com/HowItWorks.htm. This is the best filter if your water has a pH level of 6.8 or lower. Physiological disease is almost always the result of too much acid stressing the body's pH balance. For more information on the health benefits of higher pH levels in water, please visit https://ph2o.blogspot.com/. Replace filters every 8-12 months. Specification: Type5M SedimentPurpose:Remove sand, silt, dirt and rust particlesDiameter2"Fitting1/4" femaleService life2.500 GalLength10"StageFirstHousingClearSKUH-F1033-40A Type: T28 GAC pre-filterPurpose:Remove chlorine, chloramine, aluminum, cyanide, nitrates, cysts, pesticides, VOC. Also improve test and water color & odor reductionDiameter2"Fitting1/4" femaleService life1.500 Gal or 6-8 monthsLength:10"StageSecondHousingWhiteMan. SKUCL10ROT28Carbon TypeT28 , Standard Coconut Shell GAC Type:CalcitePurpose:Increase water pH levelDiameter2"Fitting1/4" femaleService life 6-8 monthsLength:10"StageLast or before T33 polishing filterHousingWhiteMan. SKUK2548-BBTypeAcid neutralizer Type:KDF-55 / T33Purpose: To remove more effectively heavy metals (copper, lead, mercury and etc), ammonia and control microorganisms/bacteriaDiameter2"Fitting1/4" femaleService life 1500 gallons or 8-12 monthsLength:10"StageLast or before T33 post filterHousingWhiteMan. SKUK2567-BBTypeOxidation reduction process and regular carbon treatment Shipping Shipping (US): We ship within 1 business day via USPS Priority Class Mail. Shipping (International): We ship within 2 business day via USPS International Priority Mail. Return Within 15 days. Customer is responsible for the shipping. Filters must be sealed and unused. Feedback Copyright , My Aqua Filter | All rights reserved.