The ceramic micro-prefilter reduces parasites and particulates greater than 0.9 microns in size. Lead, dirt and chlorine are also reduced by carbon and special media inside the ceramic filter. Any bacteria or viruses in the water are then fully exposed to a strong Ultraviolet germicidal dose. The extraordinary Double Pass System delivers a greater dose of ultraviolet than single pass systems. The combined Ceramic + Ultraviolet provides excellent performance in reducing waterborne pathogens and other contaminants.