Patent ID: 8273185

Claim:
A method of cleaning a vehicle exhaust system filter, the filter having a first end and a second end and comprising a plurality of elongate channels containing debris to be removed, wherein the method comprises the steps of: (i)providing a chamber having an outlet in fluid communication with the first end of the filter; (ii) covering the second end of the filter to hinder fluid flow out of the second end of the filter; (iii) introducing a flow of liquid into the chamber; (iv) stopping the flow of liquid into the chamber when the chamber and channels of the filter are substantially filled with liquid; (v) introducing a pulse of compressed gas into the chamber; (vi) measuring pressure at the covered second end of the filter, and (vii) uncovering the second end of the filter only when a predetermined threshold pressure has been measured, to allow the gas to force said debris and liquid out of the second end of the filter.