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Denicotea silica gel crystal filters 9mm absorb and reduce tars and nicotine in the smoke.Each filter can be used for 15 to 20 cigarettes, depending on the tar and nicotine rating of the cigarette smoked. The used filter is easy to remove and before replacing it, it is advisable to run a thin pipe cleaner through both parts of the holder. It is also recommended to wash occasionally thoroughly.