Ashon Replacement Filters For iRobot Roomba 500/600 Series Aerovac 536,550,551,552,564 (4) It's best to replace your brushes every 1 to 2 months Suitable for Roomba 536,Roomba550 ,Roomba 551,Roomba 552, Roomba 564 Filters reduce infiltration of dust, pollen and other allergens. For use with iRobot Roomba 500 & 600 Series Vacuum Cleaning Robot with Aerovac bins Fast shipping and with tracking number!