These filters are brand new high quality replacement parts by LifeSupplyUSA, exclusively for sale by LifeSupplyUSA. It is recommended filters be washed at least every 1-3 months, depending on usage and air quality. To clean, remove filter, vacuum/use low pressure hose on both sides and rinse with water. For the removal of tough grease or smoke, you may have to wash with a mild house-hold detergent such as hand wash or dish detergent. Before re-installing into your system, be sure to let the filter dry. Mesh design makes the filter easier to wash and rugged aluminum frame, prevents corrosion or rust.