Garbage disposal grinds kitchen scraps into small pieces, once they reach the septic tank, they are suspended in the water. Some of these materials are broken down by bacterial action, but most of the grindings must be pumped out of the tank. As a result, use of a garbage disposal will significantly increase the amount of sludge and scum in your septic tank. Therefore, many states require a larger minimum size septic tank if there will be a garbage grinder/disposal unit in operation in the house
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