Discussion
Calgon conditioning works by
Answer: D
Correct answer: forming a soluble complex with calcium ions
Calgon is sodium hexametaphosphate, and it works by sequestration: it binds calcium into a soluble complex ion so that the calcium is never available to react with sulphate at all. Nothing precipitates, so there is neither scale nor sludge to remove - which distinguishes it from phosphate conditioning, where a sludge is deliberately produced.
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