Categories that air!, but it was buried in the ground to remove the air come from?!! Yes, this is a category for tank ... must use a bacteria that need oxygen to degrade sewage (Aerobic process). Where the result is carbon dioxide occurs. The advantage is that there is no smell. Sewage sludge is less. Do not pump toilet frequently, but the disadvantage is that we need to find out the oxygen, the bacteria using a Prince more or pump oxygen to them.
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