PureFlow by Premium Guard with 4 filtration levels - 1st stage PureFlow particulate filtration media - captures and eliminates particulate matter such as dust and pollen. Electrostatically charged to attract and lock fine particles of dust while allowing high-flow and high-capacity.
2nd & 3rd Stage Activated Charcoal layer that traps harmful gases – e.g. carbon monoxide , sulfur dioxide. This layer is combined with Baking soda to absorb bad smells.
4th Stage of advanced filtration. PUREFLOW is a proud supporter to the American Lung Association, for every filter sold we will donate $1 to ALA