Check the listing for details. 5pcs replacement filter set for Reverse Osmosis,Calcite & KDF-55, Membrane 75gpd. Condition: New. Listed at 69.99 USD. 1 Universal Set (4 inline filters) and 75 GPD Membrane for 5-stage Reverse Osmosis Systems, made in USA with Super Calcite (raise pH level) and KDF-55 Filters. OVERVIEW: Total filters: 4 plus 75 GPD TFC RO Membrane. 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. 3-rd stage: 75 GPD Membrane, made in USA. 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. 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 http://ph2o.blogspot.com/ . Replace filters every 8-12 months. 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 Second Housing White Man. SKU CL10ROT28 Carbon Type T28 , Standard Coconut Shell GAC Type: Calcite Purpose: Increase water pH level Diameter 2" Fitting 1/4" female Service life 6-8 months Length: 10" Stage Last or before T33 polishing filter Housing White Man. SKU K2548-BB Type Acid neutralizer 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 TYPICAL REJECTION CHARACTERISTICS OF R.O. MEMBRANES: Elements and the Percent Membranes will remove % of removal Arsenic 93%-96% Aluminum 86%-90% Bicarbonate 90% Cyanide 85%-93% Chloride 85%-92% Calcium 94%-98% Sodium 86.5%-93% Sulfate 96%-98% Potassium 84%-95% Barium 95%-98% Iron 94%-98% Nitrate 60%-76% Mercury 94%-98% Zink 95%-98% Selenium 94%-96% Lead 95%-98% Phosphate 94%-98% Magnesium 94%-98% Fluoride 82%-92% Nickel 96%-98% Cadmium 94%-98% Detergent 97%-98% Herbicides 97%-98% Insectecides 97%-98% Strontium 96% Shipping (USA and Worldwide): We ship within 2 business days via USPS Priority Mail. Returns/Exchange: Only if product is defected. Warranty: Warranty: 30 days