A 300 foot section of 6' sewer line was clogged with grease. After the City Personnel broke it free and flushed it towards the treatment plant, a gallon of BYO‐GON PX‐109 was added to the line. The operators at the plant were notified that in 21 hours, 300 feet of grease and other debris would be going to the plant. The operators were ready, but the grease never arrived. Tests on the raw flow during and after the time the shock should have arrived showed no increase in waste load. BYO‐GON PX‐I09 had already taken care of the problem.