Frostfire Countertop Drinking Water Filter with 5 Micron Carbon Block Cartridge Included Frostfire's countertop water filtration system turns tap water into healthier drinking water. High quality drinking water ideal for houses, mobile homes and campers. The Frostfire water filter is simple to install. Fit directly onto your existing kitchen tap. The water filter uses a unique diverter valve that replaces the aerator on your tap. Includes a replaceable 10-inch 5 micron carbon block cartridge.