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As a general rule, it is recommended to install a vent just before the septic tank. It will function without it, but not as well.

Okay, here's the scientific explanation:

There are two types of bacteria that grows in the tank called aerobic (with oxygen) and anaerobic (without oxygen). The vent just before the tank allows the right amount of oxygen in to promote adequate solid separation and composting of solids. Over time, the lack of oxygen in a non-vented tank will allow more solids to fall to the bottom of the tank and build up to a level high enough to bypass the baffle system and contaminate the leach field.

Like I said, it will work without a vent, but it's much more expensive to repair a plugged leach field.

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