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 mold and harmful gases – e.g. carbon monoxide , sulfur dioxide. This layer is combined with Baking soda to absorb bad smells resulting from mold and smoke.
4th Stage filtration that employs both silver and copper ions with proven, long lasting effectiveness.