HQRP Kit: Primary Filter Assembly and Exhaust Media Filter for Hoover 303902001/303903001 Replacement Plus Coaster HQRP&reg; Primary Filter Assembly + Media Filter Replacement plus HQRP&reg; Coaster; The Primary Filter is washable and should be washed at least once every 30 days; The Media HEPA filter is H13 filtration class and retains 99.95% of particles down to 0.3 micron; Filters should be changed every 3 to 6 months; 100% Compatible with Original filters; 2 weeks DOA replacement warranty!