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18 <br /> Comparison of Treatment Methods <br /> BASIC Septic Tank Soil <br /> Onsite Primary Dispersal into Final <br /> Treatment Soil Treatment <br /> System <br /> DSE DSE <br /> Advanced Septic Tank Soil <br /> Onsite Primary Advanced Pre- Dispersal into Final <br /> Treatment Treatment Soil Treatment <br /> S stem <br /> y DSE TS-1 or TS-1I TS-1 or TS-1I <br /> Package Septic Tank <br /> Treatment Primary Advanced Pre- Di / Stream to <br /> System <br /> Treatment Treatment Ditch Stream <br /> DSE TS-1 or TS-11 <br />