Protec Humidifier Cleaning Fish The Protec Antimicrobial Cleaning Cartridge features a patented antimicrobial, Aquastat, that continuously works to inhibit the growth of bacteria and mold as well as help prevent the buildup of slime in the water and humidifier surfaces..This cartridge keeps cleaning for 30 days & will work in most humidifiers, vaporizers, & steamers. The Protec Antimicrobial Cleaning Cartridge uses the same antimicrobial that has been used for years in drinking water filters to prevent objectionable odors, tastes.