For SQ10, SQ15 and SQ17 models -
Plastic Coated filter liner offers an additional stage of
filtration when bags cannot be used (eg, wet/moist or large/sharp
debris pickup). It also protects the filter element.
Debris hits the liner and falls
to the bottom of the canister. Plastic surface coating cleans up
easily. Note-I try to keep at least one of these liners in stock. If not, lead time could be 4-6 weeks if this item has to come from Europe.