How much percent of impurities are enough to make domestic sewage unfit for humans?

How much percent of impurities are enough to make domestic sewage unfit for humans?

Q. How much percent of impurities are enough to make domestic sewage unfit for humans?

  1. 0.1 percent
  2. 1 percent
  3. 5 percent
  4. 10 percent

Answer: 0.1 percent

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