The CS crystals are mixed with the solvent in a bucket & poured in the container on the right. The one on the left is just filled with solvent. The engine is warmed up, a blanking pug is unscrewed from a boss that has already been brazed to an aperture made in the side of the exhaust pipe. The blanking plug is unscrewed from the pipe from the pump, the main tap turned on, the selector tap is switched to the CS & pump turned on.
When finished the solvent is switched on instead to flush the system through.