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Why is the interior of my concrete septic tank deteriorating?

Deterioration of the concrete septic tank is typically caused by hydrogen sulfide gas. Most deterioration issues are associated with heavy garbage disposal usage as the rotting food creates hydrogen sulfide. Also, backwash from some water softeners into the septic tank using salt for water treatment can also create hydrogen sulfide. Since it is a gas, the deterioration occurs above the water line in the tank.