Water Conditioning & Purification Magazine

Drainfield

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The long, underground, perforated pipes or tiles connected to a septic tank, usually laid in gravel-filled trenches (two to three feet wide) or beds (over three feet wide) in the soil. Liquid waste (effluent) flows out of the tank and is evenly distributed into the soil through this piping system. The soil below the drainfield provides the final treatment and disposal of the septic tank effluent. After the effluent has passed into the soil, most of it percolates downward and outward, eventually entering the groundwater. A small percentage is taken up by plants through their roots, or evaporates from the soil.

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