Aerosol Disposal Combo FilterMfr #: 28224 The colormetric indicator tells you exactly when to change the filter cartridge for Aerosolv Standard or Super System Filter life is 9 months or 2,250 cans with changing the Carbon Cartridge (upper portion) twice This aerosol can recycling filter replaces comes with two piece filters to capture odors and potentially harmful VOCs Cartridge life is 3 months or 750 cans; more frequent change outs may be necessary based on use