I can't imagine any "household" type use of bleach in the relatively small quanties mentioned would have a detrimental effect on the digestive properties of a typical septic tank. Think of how much detergents and bleach are used for normal bathing and washing. And you have to consider the bacteria-laden solids---several hundred gallons worth in the first chamber alone that would have to be completely stirred up and sterilized.

But if you are concerned you're taxing the system with bleach, a gallon or two of very soured milk poured down the drain, I'm told, will straighten that out.

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