Felix Derousselle guides multiple sections of 10-foot rods into the main sewer line. Edmond city employees assigned to field services , wastewater line management division, use specialty tools to clean out a sewer line behind houses on Rimrock Road on Wednesday. Nov. 16, 2011. The crews use 10 foot rod sections that are coupled and inserted into the main line. Additional sections of rod are added until the obstruction is reached. In this photo, the workers are performing a process called mechanical sawing. Photo by Jim Beckel, The Oklahoman