17x21x1 Exact MERV 12 Plus Carbon AC Furnace Filters 12 Pack beneficial microbes Treat all of the water

Treat all of the water holding sites in connected water systems to maximize efficiency of the treatment program

Shelf life is best maintained between 50°F–85°F

Add 12 ml per gallon of water once per week or with every feeding

Drive belts last many hours but eventually wear down

Please use a tape measure to get the actual size of your current air filter when ordering custom sizes

17x21x1 Exact MERV 12 Plus Carbon AC Furnace Filters 12 Pack beneficial microbes Treat all of the waterNordic Pure pleated AC air filters are made of electrostatically charged synthetic materials that attract and capture most airborne particulates in your home or office. Each time air passes through a Nordic Pure pleated furnace filter, lint, household dust, pollen, dust mites, pet dander, baking flour, mold spores and other contaminants are removed. Our filter media prevents the growth of bacteria or mold, resulting in a much healthier living space.