consume many of the harmful bacteria. The septic tank is anaerobic, meaning that it operates without oxygen. To successfully treat effluent, however, soils must be aerobic, meaning that they have access to atmospheric oxygen. Soils must do the rest of the purification, and they do this by several processes. Table 7. Quality of residential wastewater and effluent from a septic tank and sand filter. Solids that are allowed to pass from the septic tank can clog the pores in the soil of the absorption field. Keeping solids out of the absorption field not only prevents clogging, but also reduces potentially expensive repair or replacement costs and helps extend the time that a soil can effectively treat septic tank effluent. An effective safeguard in keeping solids out of the absorption field is the use of effluent filters on the outlet of the septic tank. When these filters plug, they can be hosed off when the tank is pumped. This is an inexpensive but effective way to protect the expensive soil absorption field. While typically designed to hold a minimum of 1,000 gallons of wastewater, the size of the tank may vary
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