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Chloramines, or combined chlorine are the by-products of free chlorine reacting with organic material. If there are too many, the pool has been improperly treated, or a huge amount of organics has overwhelmed the system. Chlorinates are things into which you've added or introduced chlorine.

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Thanks for this clarification, my knowledge of chemistry is quite poor. I remember the pool manager trying to tell me that 'if anything, the chlorine levels are low'. I suspect this was because any chlorine they added was very rapidly being turned into chloramine by-products.

Yes, that's usually the case. Chlorine is actually pretty odorless until it reacts with something.

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