Thanks Mick for so much help and info - I have googled ' pond water chlorine removal' and find it really complicated

One site was talking about water filters - some remove chlorine, some chloramine?
I have a filter running, will this remove the chlorine, or will it just balance out over time?
Sorry, a 'newbie' with little experience

I asked the man I purchased the golden orf from - he said they naturally swim upstream, that is probably why they are jumping into the flow.
The other goldfish still has the redness round his gills, a little more active - just hope he isnt suffering. As I said before, all other (12) fish seem really happy

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Thanks for your time and reply,
Keep on learning!