Cleaire had a major problem following the suspension of CARB verification for their LongMile DPF system, which was their most widely sold technology. This used a metalic substrate which proved unstable and the catalytic coating sintered sparks which caused a major roadside fire in Washington state causing over $20 million of damage. The verification was immediately suspended and Cleaire were obliged to enter a program of either reimbursing purchasers the cost of the filters or replacing, at their own cost, the DPFs with metalic substrate with filters with silicone carbide substrate. The cost has clearly been beyond their capacity to fund. CDTI (ECS) DPFs use silicon carbide substrate which is stable at temperatures of up to 2800 degrees celcius which is double the temperature at which a metalic substrate becomes unstable.