For a well
At usage point only. Eliminate the disagreeable metallic taste, which often has a sulfurous odour resembling rotten eggs, without having to consume over purified water having lost most of its healthy attributes.
For water from a municipal or private network
At usage point (as opposed to entry point). Eliminate the bitter or chlorine taste or the chlorine odours or still, the algae or mould odours as well as the toxic sub-products of chlorination.
