Discussion
Internal or in-boiler conditioning differs from external softening in that it
Answer: B
Correct answer: treats the water after it has entered the boiler
Internal conditioning doses chemicals directly into the boiler so that any hardness getting through is converted into a harmless sludge that can be blown down. It is a supplement to external treatment rather than a substitute, since it deals with the residue that softening leaves rather than preventing the hardness from arriving.
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