Activated Carbon Filter For Reusable Face Mask Sports Cycling Air Purifying Lots. (Filters Only, Not includes Mask). Five layer activated carbon filter pack for reusable sports cycling. Face masks and other dual valve masks. Replace filters after 3-30 days of use depending on pollution level or when the inner layer turns grey.
Rotate exhaust valves counterclockwise to unlock. Remove the valves and filter.
Filters can be recycle as polypropylene plastic. If washing the mask, soak it in warm water and detergent.Insert inner valve pieces into the mask and stretch new filters over the valves. Rotate outer valve pieces clockwise to lock. We offer 100% satisfaction guarantee.