The picture above supports a significant observation. Engines equipped with the Fitch Fuel Catalyst "burn clean" with noticeably less soot and other toxic emissions. The section of exhaust pipe on the right was cut out of a commercial fishing boat to be replaced due to a crack in the stainless steel liner. The fact that there was no evidence of carbon deposits on this old "wrinkle belly" surprised the pipe fabricator who built the replacement section shown on the left. In fact, he said, he's never seen one this clean on the inside in 35 years of working on them.
This particular engine had had a Fitch Fuel Catalyst installed approximately 300 hours before the vessel owner decided to repair the cracked section of pipe. The white residue is probably calcium carbonate that coated the inside surface of the pipe when a head gasket leaked coolant during the engines 20,000 hours of use. This vessel (f/v New Stella) is reporting 15% savings on fuel costs (estimated $20,000 per year savings). See testimonial letter from Western Fish Company.