The C3 is a different approach than Reverse Osmosis that completely strips your water of its healthy mineral content and also wastes approximately 10 gallons to ever 1 gallon you drink. The C3 unit is a filtration unit that uses a direct filtering process to produce healthy drinking water that still contains healthy mineral content. It is perfect for use with a water ionizer. The Chanson Water C3 pre-filter is the ultimate in water filtration technology. There is not an ionizer filter on the market that can compete with our triple- canister filtered water. Each C3 canister is devoted to removing harmful chemicals, heavy metals, fluoride, chlorine, and over 100 additional contaminants. The C3 is a three stage filtration system devoted to addressing a different set of harmful chemicals, heavy metals, fluoride, chlorine, and over 100 additional contaminants.