Not Only Alkaline Water – But Contaminants Gone! The first task of a Water Ionizer is to filter harmful components of the water: chlorine, trihalomethanes, phenols, sediment, odor, taste, organic waste, and bacteria of all kinds. Most Water Ionizer units use seven levels of filtration including high quality activated carbon, calcium, antifungal felt, and more. Heavy metals, parasites, organic hydrocarbons and a long list of other contaminants never reach your lips.