We are often asked to comment on the waste of backwash and rinse water from our Iron Max well water filters. Actually there is no wasted water in the classic sense. The Iron Max iron filter does not add any chemicals to the water so the water going to drain has pretty much the same chemistry as the source water. Some constituents such as iron and manganese are in higher concentrations, but the water is still usable. Our RDWS-NS Sediment Filters fall into the same category where the backwash water simply contains excess sediment accumulated by the filter.