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,Marion County OREGON COMMUNITY D~-VELOPMENT DEPARTMENT SAND FILTER SYSTEM OPERATION AND MAINTENANCE The following information describes the operation and maintenance needs of your Sand Filter System. The septic tank acts as a separation chamber for both settleable and floating solid material. The solids are retained in the tank and the liquid is allowed to flow through the tank. The tank efficiency is partly dependent its capaci- ty. The maintenance of a septic tank serving a Sand Filter system must be pumped a minimum of once every four (4) years. The purpose is to keep the level of solid material in the tank at a level that will not allow the flow of solids out of the tank and into the Sand Filter unit. A notification letter will be sent based on the system completion date of /~//~/~ .... The second tank in the system is a dosing tank which contains the effluent pump apparatus. The system is set to discharge approximately ninety (90) gallons per cycle for a homesite with a sewage flow up to 450 gallons per day. The pump station should be inspected and tested yearly. Any changes in operating level, leaks in valves or piping, presence of foreign matter, etc. should be corrected. If your system contains a dosing siphon instead of a pump, the same instructions apply as noted above. The pump/siphon is surrounded by a small diameter mesh screen. It's purpose is to restrict the flow of suspended solid material to the pump. If allowed to-. pass through the pump, this material could clog the distribution system in the Sand Filter and cause a failure in the system. The screen should be inspected yearly and cleaned as needed. A garbage disposal in not recommended. If you have or plan to add one to your kitchen, caution should be exercised with its use. The added wastes can contribute to system performance problems. The septic tank should be pumped more often with a disposal on the system, possibly every two (2) years. There are several things you should not do to a Sand Filter: 1. Flush unusual or high strength wastes such as photographic chemicals or water softener backwash. Ignore leaks in plumbing, especially toilets. The additional water flow can cause system failure. Significantly change the use of the system thereby increasing the waste strength or volume such as adult foster care, beauty salons, etc.. Use chemical or biological septic treatments as these can have an adverse effect on system components and/or effluent characteristics.