Water filter systems may have activated carbon filters, an ion exchange unit, a reverse osmosis unit or a distillation unit.
Activated carbon filters remove organic contaminants, cleaning solvents, pesticides and chlorination by-products.
An ion exchange unit removes minerals, radium, barium and even fluoride.
A reverse osmosis unit filters out nitrate, sodium, odours, and foul taste. A distillation unit helps remove nitrate, bacteria, hardness and most organic compounds.