Next time you schedule a pumpout, ask if they can inspect the "baffles." If I inderstand it right, this is the piece that is supposed to reduce the amount of particles enterring the leaching portion of the system. It can get clogged or, depending on what it's made of, crumble. If you are lucky and this is the problem it is a relatively simple fix compared to a new leach field.
The inspection process is simple. The septic tank needs to be drained or at least not close to full. The inspector may need to have access toa hose so the baffle can be washed. It is usually vied by a mirror on a stick, a fiber optic lens or a micro-camera.
Good luck!
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