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Pressure
and low pressure pipe (LPP) systems are shallow, dosed
soil absorption systems. The effluent flows by gravity from
the pretreatment system to the pump chamber. When a predetermined
level within the pump chamber is reached (usually marked by
a float control), the pump forces the effluent through the
distribution lines under pressure. This allows effluent to
be evenly dosed at intervals. Dosing frequencies may vary
between sites and soil conditions. Differences between these
systems include the amount of pressure and pipe size.
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