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Three of the following are internal conditioning methods. The exception is

  • A.calgon conditioning
  • B.colloidal conditioning
  • C.the hot lime-soda process
  • D.phosphate conditioning

Answer: C

Lime-soda is an external treatment applied in its own plant before the water ever enters the boiler. The other three are chemicals dosed into the boiler itself to deal with whatever hardness arrives there despite the external treatment.

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