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A hardness of 250 ppm expressed in degrees French is

  • A.250
  • B.25
  • C.17.5
  • D.2.5

Answer: B

Each French degree is 10 parts per million, so 250 divided by 10 gives 25. In Clark degrees the same water measures about 17.5, and the conversion between the two is simply the ratio 14.3 to 10. A water of this hardness is decidedly hard and needs softening before boiler use.

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