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A conventional septic
system consists of a septic tank and three-inch or four-inch
perforated drainfield pipe. The sewage enters the septic tank where
the solids settle on the bottom of the tank, the grease floats to
the top of the tank and the sewage is partially treated by anaerobic
bacteria. In a properly designed, dual-compartment septic tank, the
partially-treated sewage gravity flows from the primary compartment,
where most of the solids are removed, through a baffle into the
clarifier compartment and out of the tank from the clear zone (the
level at which the fewest solids are present) to the drainfield.
Conventional drainfields commonly are constructed using four-inch
sewer and drain pipe installed in gravel-lined trenches or using
eight-inch graveless drainfield pipe that is surrounded with a
geotextile fabric “sock”. While the cost of using either is
comparable, the ease of handling renders the use of graveless pipe a
less labor intensive one for the installer. Four-inch pipe and
gravelless pipe perform equally well in Class 1b, Class II or Class
III soils assuming the absence of soil or site constraints
prohibiting the use of either.
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The Adobe Acrobat®
PDF format allows the schematics to be viewed and printed in the
flyer's original format. |
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