Humidifier - Universal - Humidifier Tank Cleaner, 0.35 oz (1 pack), 3 oz Highlights Universal Humidifier Tank Cleaner, 0.35 oz (1 pack), 3 oz Humidifier Tank Cleaner, 0.35 ounces (1-pack), 3 ounces Product is shipped based on the color or size of the main product page image. The Protece Anti-Microbial Cleaning Cartridge features a patented anti-microbial, aquastat that works continuously to inhibit the growth of bacteria and mold as well as helping to prevent sludge build-up in water and humidifier surfaces .AQUASTAT contains no harsh chemicals or harsh acids making the cleaning action just as gentle as water on the surfaces and components of your humidifier.Plus, the Protec cartridge is free of any harmful chemicals while providing a fresh, clean mist.Protec Anti-Antimicrobial Cleaning Cartridge uses the same antimicrobial used for years in drinking water filters to prevent unpleasant odors, tastes.