StoneVac Series Dust Collectors HEPA Filter Cartridge (PN 97001): every three to six months.Dust Bin Bags (PN 97002): as needed, whenever full. Email Filter Replacement Reminders Shop Filters: Stone Vac Dust Bin Bags, 10-pack – 97002 $9.64 View Details Add to cart Replacement HEPA Filter – 97001 $86.64 View Details Add to cart More Product Filter Replacement Information