FRAM SynWash LLA4309 Long Life Air Filter Filters 99% of harmful particles Wash in minutes for like-new performance Use the hose-end sprayer and household dish soap and the filter can be cleaned in less than 5 minutes with minimal down-time for drying Construction that's built to last with a 430 Heavy gauge stainless steel screen and a high-density gasket for increased durability FRAM recommends washing once a year or every 12,000 miles