Filter Twin Pack -Metro™ £22.99 Share Pinterest Twitter Facebook This filter has a DACC Activated Charcoal layer for the filtration of gases and vapours and a scrim layer that filters out PM10. (Particulate matter greater than 10 microns in size). Continue reading Size Medium Large Quantity £22.99 Features Benefits Suitable for Combination filter comprising chemical and micron size particle filtrationDACC™ Activated CharcoalFace soft material Filters out gases and vapours PM10 (Particulate matter greater than 10 microns in size). In polluted citiesEnvironments with bad air/smog