The Reverse Osmosis Process is the removal of up to 99.9% of undesirable water contaminants by forcing untreated water through a semi-permeable membrane. Pressure forces the water to flow in the reverse direction to the direction of flow in natural osmosis.Standard FeaturesUniversal Adapter with Wing Valve fits most faucets threads. Build in wing valve to control the rejected water.Tanks level Controls (TLC) senses the water level through 3 stainless steel sensors installed through the wall of the CT holding tank. The results are: Conserves water and energy. Positive Level control and shut-off Extends system component life. Spin-Weld Seals Cap and Body with build-in check valve, flow restrictor fittings, and membrane all in one injection molded piece.Membranes are 100% flushed, rinse and tested for a minimum the two hours.Requires no tool on service. Eliminate leakage from fittings. Cleaning is greatly reduced for more compact space. Easy installation. Easy connect faucet adapter fits most household faucet 1st Stage : Sediment Depth FilterPart Number: QSF-25003 (5 Micron)(Polypropylene Melt-blown Depth Filter) Specifications:Max. Flow : 1.0 GPMMax. Pressure : 125 psiMax. Temperature : 125°F (52°C)Service Life : 5,000 gallonsFeatures:100% Polypropylene NSF Certified MaterialParticle Removal (dirt, sediment, rust particles, and other particulates)Improving Water Clarity, Taste, and OdorGreater Dirt-holding Capacity with Multi-layers Gradient DesignHigh Flow Rate, Low Pressure Drop2nd Stage : Granulated Activated Carbon FilterPart Number : QGA(Granulated Coconut Shell Carbon 12x40 mesh size)Specifications:Max. Flow: 0.75 GPMMax. Pressure: 125 psiMax. Temperature: 125°F (52°C)Service Life: 2,500 GallonsFeatures:100% Coconut Base Carbon NSF Certified MaterialChlorine, Odor and Bad Taste RemovalTremendous Surface Area Resulting From Its Porous StructureMaximum Adsorption ProcessGreat Removing Volatile Organic Carbon Compounds (insecticides and/or pesticides)High Flow Rate, Low Pressure Drop3rd Stage: Coconut Shell Carbon Block FilterPart Number: QCB-25001 (5 Micron)Specifications:Max. Flow: 1.0 GPMMax. Pressure: 125 psiMax. Temperature: 125°F (52°C)Service Life: 2,500 GallonsFeatures:100% Coconut Base Carbon NSF Certified MaterialChlorine, Odor and Bad Taste RemovalHigh Adsorptive Capacity and EfficiencyGreat Removing Volatile Organic Carbon Compounds (insecticides and/or pesticies)No ChannelingNo Release of Carbon FinesHigh Flow Rate, Low Pressure Drop4th Stage : RO Membrane FilterPart Number : QME-25050 (50 gallons per day) Specifications:Up to a 98% Rejection Rate*Polyamide Thin-Film CompositeMax. Pressure: 150 psigMax. Temperature: 113° (45°C)Max. Feed Flow Rate: 2 GPMMax. Feed Silt Density Index (SDI) : 5pH Range: 2-11Service Life: 2-3 yearsFeatures:Reduce TDS value in waterReduce 98% of dissolved minerals, salts and other chemical contaminates in potable water supply*Remove most harmful chemicalsReduce E.coli in potable waterRemove most heavy metalsReduce TDS, Barium, Cadium, Hexavalen & Trivalent Chromium, Copper, Lead, Radium 226/228, Selenium, Fluoride, Nitrite, Nitrate (see owner manual for more details)5th Stage : Granular Activated Carbon Part Number : QGA(Granular Coconut Shell Carbon: 12x40 mesh size) Specifications:Max. Flow: 1.0 GPMMax. Pressure: 125 psiMax. Temperature: 125°FMin. Temperature: 35°F (2°C)Service Life: 2,500 gallonsFeatures:Chlorine Taste and Odor ReductionNSF Certified and Particulate Class VSimple Basic Design with Best EfficiencyHigh Grade NSF Certified Coconut Shell CarbonNo channeling or clogging