Influent is conveyed through the PVC piping to the first of six internal sedimentation chambers. The 10.2 cm diameter inlet pipe is covered with a burlap sack that traps larger particles and debris. Synthetic screens and woven geotextiles placed within the bulkheads filter the flow as it passes into the succeeding chamber. Flow is conveyed through larger mesh sizes in the first series of sedimentation chambers, followed by smaller mesh sizes in the remaining sedimentation chambers. In addition to the filter screens, skimmers have been installed in the tanks.
Skimmers replace the previously used screens and combination of screens and skimmers.
The skimmers float on the water surface within each chamber and have an opening 15.2 cm below the surface through which flow is conveyed to the following tank. The skimmers prevent sediment from being conveyed to the subsequent chamber. Sediments which collect in the bottom of the chamber remain in that chamber until the unit is maintained. The bulkhead separating the last two sedimentation chambers is fitted with an inverted elbow which traps oil and grease within the fifth chamber. The elbow is located approximately 25.4 cm from the chamber bottom.