MICROPOROUS FILTER MEDIA WITH INTRINSIC SAFETY FEATURE

摘要

The present invention is directed to a microporous filter medium treated wit h a microbiological interception enhancing agent comprising a cationic chemica l having a medium to high charge density and a molecular weight greater than about 5000 Daltons, adsorbed on at least a portion of the microporous structure, and a biologically active metal in direct proximity to the cation ic chemical and also on at least a portion of the microporous structure, wherei n the flow of fluid through the filter medium decreases in response to an amou nt of polyanionic acids present in an influent. Robust microbiological interception is still maintained due to the extended empty bed contact time as a result of the diminished flow rate.