We recommend that you clean iRobot Roomba Spare parts every 1-3 uses. (depending upon the amount of dirt and debris in your home). It's best to replace your spare parts every 1 to 2 months to keep your home robot operating at peak performance.

• Clean brushes keep your home robot operating at peak performance.
• For use with iRobot Roomba 800&900 Series only.
• Side brushes are easy to remove and replace as part of routine maintenance.
• Filters maintain Roomba's cleaning performance while reducing infiltration of dust, pollen and other allergens into the air you breathe.
• Package: hepa filter x 4pcs; 3-arms side bush x 6 pcs

Clean brushes keep your home robot operating at peak performance.LOVE(TM)