The carbon filter by Dr. Pearl is one of the classics among the pipe filters and convinces with its high filtration performance and excellent taste neutrality. An increase in filter performance is achieved by the different perforation or number of holes at the two end caps. This increases the degree of swirl and thus also significantly increases the smoke reduction. In contrast to other activated carbon filters, the direction of insertion is therefore not unimportant at all... the blue cap belongs to the mouth end.
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