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The Septic Tank <br /> Untreated household sewage would quickly clog any system The heavier, solid particles in the sewage settle to the <br /> if applied directly to the soil. The function of the septic tank is bottom of the tank forming a layer of sludge. Lighter <br /> w primarily a settling tank allowing solids to settle to the bottom materials, including fat and grease,float to the surface, <br /> M9 of the tank while a somewhat cleaner liquid is discharged to forming a scum layer. <br /> �' the GSF system for additional treatment. Septic tanks may • Bacteria living in the septic tank break down some of the <br /> ;�contain one or more compartments, or the designer may organic solids into liquid components, helping to reduce <br /> have specified two or more tanks for your system.Cn the build up of sludge in the tank. <br /> C. o Regardless of the number of compartments or tanks in • Sludge and scum are stored in the septic tank rather than <br /> CD your system, the basic principle is the same. Within the tank, being allowed to flow out of the septic tank,where they <br /> as shown below, four important processes take place. would quickly create problems. <br /> Q The septic tank filter and/or baffles prevent scum and other <br /> cD a • Access Port floatable materials from flowing out to the GSF system. <br /> z • Inlet Pipe <br /> too Access Port <br /> n_ m • Scum Layer <br /> 3 p <br /> CD _ Outlet Pipe <br /> Clarified Zone M* <br /> m Filter <br /> o Baffles <br /> M- Ln <br /> Cnn Clarified Zone <br /> • Sludge Layer <br /> a - Sludge Layer <br /> k T <br /> 6 <br />