When inserted into Bondi Air Co's reusable masks, these PM2.5 filters offer a high degree of protection and lower inhalation resistance than other filters or masks. - 10 pack of Filters - PM2.5 Filter for the smallest and most dangerous forms of air pollution - 5 Layer system, with central layer of activated carbon fibre - With constant or extreme usage the filter should be changed every 40 hours - With occasional use these filters can be effective for around 2 weeks. - Wash you re-usable mask between filter changes
