A method and apparatus for forming a flexible circuit of predetermined design, and in particular to the making of a functioning flexible circuit by depositing multiple layers of a variety of materials in fluid or component form in a set configuration onto a substrate. The method may be practiced in sewage treatment plants and also may be used for treatment and ordour supression in holding tanks and the like. The outer teeth couple to the cam drivethe timing chain, timing belt or timing gears. The power roller is sandwiched between the first and second disks in a state being rotatably supported at inner surface of the trunnion.