This was the perfect replacement for my 770 Roomba. I blew out the filters to extend their life a bit but they were really clogged so it was time to replace them. This has helped filter out more of the fine dust particles on the floor and I know it's working because I can already see dust build up. In the photo on the left is the filter I installed yesterday. It has run at least twice since then. The filter on the right, as you can see, is another brand new one. They definitely do what they are supposed to and fit very well. Possibly too tight, which is preferable as less dust collects around them. Overall a great alternative to original OEM filters.
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