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Gravelless
and chamber systems use some material other than gravel
or rock in the excavation to provide an infiltrative surface
onto which septic tank effluent is distributed along the length
of the trench. These systems provide some capacity to store
effluent until it can be absorbed into the soil and also may
inhibit sand and silt infiltration. Soil compaction can be
reduced since the need to use heavy equipment to haul and
place gravel is eliminated.
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