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Review title: Get a canister filter
Product review: The idea is good--use a finer filter to remove the more dangerous dust. The problem is that these bag filters are not very efficient. You need two bag filters or a bag filter and a plastic collection bag to make it work effectively. If you are going to bother upgrading your dust collector, it makes more sense to buy a good canister filter and mount it on the dust collector. (You can find one example by searching "9e300bl conversion" on the web. Alternatively look for canister dust filter.)
