Global Water (GWFILTERS) 3 Stage Replacement Filter SetGlobal Water GWFILTERS 3 Stage Replacement Filter Set Sediment, GAC, and carbon block filtration for bottleless water coolers and under sink systems 5 Micron Sediment 1 Micron GAC 0. 5 Micron Carbon Block Lead Reduction The GWFILTERS replacement filter set uses a three stage process to remove sediment, chemicals, and microscopic contaminants from municipal water. Each filter targets specific impuritiesfrom visible rust and silt to dissolved lead and