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jo,
sorry to hear that you are having problem with your beloved koi. ALthough I am no expert of koi illness, I will go it a shot. BTW, you may want to visit
koivet.com for help. (moderator, I hope it is OK to mention koivet.com).
First of all, I like to ask you about the water quality. Have you done any testing on the water quality ? can you post some of those data ? Tha will help alot.
what is the toal volumn of your pond ? How many koi/fishes do you have in them, how often do you do water change.
Sap is everywhere, you cannot eliminate them completely from your pond. It only become a problem when the environment becomes favourable for them. In most cases, that means poor water quality, over crowded pond, and/or injury on koi.
You should fix any water quality and/or over-crowdiness in your pond first.
As for treating the koi, I think it is better that you only apply medication to the infected spots, bombing the whole pond is not a very good solution. You can use either iodine, hydrogen peroxide or PP pater to swap the infected spot, apply some triple-anti biotic oinment over the spot after swapping.
I think you are over-treating your koi.
stan
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