3 x Aero Vac Filter for iRobot Roomba 500 600 Series 536 550 551 620 650 Vacuum Cleaner Replace the irobot roomba filter every 2-3 months to maintain roomba's cleaning performance while reducing infiltration of dust, pollen and other allergens The filters are easy to see and access, so you can snap them on and off with minimal effort Compatible with all roomba 500 series robots with aerovac bins Will not replace red or yellow standard filters