(Are they made in another unnamed country?) They don't work like Roomba products. I noticed a lot of dirt on the fan/motor behind the filter, which I never noticed with the original Roomba filter. While they're a lot cheaper than Roomba filters, if I have to replace the canister because the dirt built up in the motor is clogging it, it's not worth it. You get what you pay for! I should have known better.
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