CRYSTAL QUEST Whole House Acid Neutralizing 1.5 Water Filter Systems contain naturally occurring, crushed and screened white marble, calcium carbonate media. It is used to neutralize acidic or low pH waters to a neutral, less corrosive effluent. Acidic water can leach unhealthy levels of copper from pipes and cause greenish-blue stains on fixtures. It can cause many other corrosion problems as well and drastically shorten the life of all water-using equipment, including dishwashers, washing machines and hot water heaters, as well as fixtures. When acid pH water (below 6.8) is passed through the filter, calcium carbonate is slowly dissolved into the water, increasing the pH to a neutral level. An automatic backwashing cleans the bed and prevents compaction. will normally last approximately 3 years. The media slowly dissolves over time and will need to be refilled about every 2-3 years, depending on the amount of water you use, and the pH of your raw water entering the unit. It travels through 3 stages of filtration. In Stage 1, water flows through a 20-inch sediment filter cartridge that removes sediment, silt, sand dirt. It also extends the life of water softeners, water filters, and prevents damage to control valves or pumps. Next, water flows through an acid neutralizing filter media mineral tank. Finally, in the third stage, water flows through a 20-inch solid carbon cartridge for removing volatile organic carbon compounds (VOCs), insecticides, pesticides and industrial solvents. CRYSTAL QUEST Whole House Acid Neutralizing 1.5 Water Filter System also features: A Poly Glass mineral tank, Riser style 1-inch internal flow distributor, a solid state microprocessor with LED display Electronics control valve and a Stainless Steel Bypass Valve.