I think your fish has either been through the wars somewhat Kira there are scales that have been damaged that now appear to be regenerating and as such they are nothing much to worry about the white spots on the dorsal could well be what we call dings where the fins of the fish hit something you get white spots that seem like white pimples they normally disapear as the fins repair themselves with .
May I ask if your fish have been netted at all in the last month or two as bad netting techniques can cause damage like you are seeing scale wise .
I can asure you what we an see isnt that much to worry about however it does show you care .
May I suggest a few good books to you available on Amazon US :-
The Manual of Fish Health ISBN 0861013869. Dr Chris Andrews Adrian Exell, Dr Neville Carrington.
It should give you a good grounding on fish health issues and was the veryu first book in our now extensive fish health library:-
Hand Book of Fish Diseases (All Fish) ISBN 0866227032. Dieter Untergasser.
These should help you with fish health issues
Next issue dechloinating large amounts of water , rather tan use dechloination liquid why not get one of these :-
http://www.vyair.com/scripts/prodView.asp?idproduct=67
They do 100,000's of gallons before you need change the filters , it means you can slowly trickle water into the pond via your hosepipe without having to stop to add more dechlorinator each time
Dave