Anti-Bacterial Filter For Fridge Freezers. 100% Of The Fridge Air Passes Through This High-tech Filter. Microban� Active Ingredients Are Incorporated Into The Polymer Structure Of The Air Filter During Manufacture. They Are Evenly Distributed Throughout The Fibers Of The Entire Surface Area And Deep Within The Filter. Proven Effective Against : Listeria Monocytogenes, Staphylococcus Aureus, Escherichia Coli 0157, Salmonella Enteritidis, Aspergillus Niger. The Perfect Way Of Keeping Your Fridge Fresh And Hygienically Clean! Supplied With "timestrip" Indicator That Shows When Filter Needs Replacing. It Is Recommended To Replace Filter Every 6 Months For Optimum Cleaning Performance.