SELFCLEAN Filter Bag SC FIS-CT MIDI/5 - 498411QUANTITY 5 The new self cleaning filter bags for the CT MIDI dust extractor solves a problem that plagues other dust extractors and vacuums. During normal use, fine particles of dust cling to the inner lining of the filter bag resulting in caking. This coating of dust lowers the effective suction power dramatically resulting in poor extraction efficiency and performance. Caking can also cause additional strain on your dust extractor's motor and