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; pesticides, herbicides, Mercury, Chlorine, Chloramine, and stops bacteria from growing 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. Product Features: