Polishing systems are used to improve the quality of septic tank system effluent. Effluent polishing may be necessary due to site constraints, regulations, or other limiting factors. One of the most common technologies used to polish septic tank effluent is the sand filter. Because sand filters can be designed in various configurations, they are highly flexible and can be adapted to many different types of sites, making them ideal for use in different community settings. The three types of sand filters typically used for septic tank polishing include buried, intermittent, and recirculating sand filters. Treatment of effluent by sand filter systems involves physical, chemical, and biological processes. Suspended solids are removed principally b
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