ZeroWater's 5-stage filtration technology removes 2x the TDS versus leading competitors. The 5-stage filter transforms your tap water into delicious, TDS-free drinking water. Get more out of your water with ZeroWater's 5- Stage Water Filtration. 5-Stage Filtration: Stage 1 - Removes suspended solids such as dust and rust that make your water appear cloudy Stage 2 - Removes additional suspended solids Stage 3 - Removes organic contaminants; Mercury, Chlorine, Chloramine Stage 4 - Removes inorganic compounds i.e. metals, nonmetals and radiological contaminants. Stage 5 - Removes remaining suspended solids, holds the resin in place What is TDS: Total Dissolved Solids (TDS) refer to minerals, salts, metals including lead, chemicals, fluoride and runoff polluting your drinking water. ZeroWater Technology is the only water filtration system to remove 99% of TDS, equivalent to TDS in purified bottled water. Get more out of your water with ZeroWater's Premium 5-Stage Water Filtration.