“MoCobee CT” developed by COMOTEC corporation is an efficient device for removal of PM(particulate matter) and black smoke. It can remove more than 90% of PM and about 99% of black smoke from a diesel engine. As filters in MoCobee are made of SiC(silicon carbide) which has excellent heat resisitance, used filters can be regenerated by electric hearter “MoCobee RT”. It realizes semiparmanent cycle of usage and recovery.