This iRobot 21936 replenishment kit features 3 sets of dual HEPA filters and replacement bristle, beater and side brushes to keep your iRobot Roomba 700 series robotic vacuum effectively cleaning. A brush-cleaning tool facilitates maintenance.
My Roomba is 2 yrs old. Works well for me to maintain my house with two large dogs. The side brush had broken after few months. I clean the system periodically but it never occured to me that replacing the filters and brushes would rejuvenate the Roomba. Serendipitously I found this kit, only one left in the store. My Roomba is working just as new now. The kit was expensive, wish they priced it lower since it is a recurring investment.