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A low-pressure dosing system (LPD) treats wastewater then pumps it into the soil several times daily. Of the nonstandard drain fields, it is the least expensive to install and operate.
The system generally has three components:
The pump tank houses a pump that discharges wastewater to the discharge system three or four times a day. The distribution system consists of a small pipe with holes drilled in it, laid in narrow 6 to 12 inch-wide trenches. The pump discharges wastewater to the trenches. Once in the trench, the wastewater seeps into the soil.
The soil provides most of the wastewater treatment. Soil particles filter solids and organic matter from the wastewater. Microbes in the soil break down the solids and kill the bacteria and pathogens in the wastewater.
The sizes of the septic tank, pump tank, and distribution system are based on the number of bedrooms in the house and the type of soil where the distribution system will be placed.
Reference: Lesikar, Bruce. Agricultural Communications, The Texas A&M University System. Low-pressure dosing. Publication L-5235. 6 Sept. 1999.