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Folks are going to tell you that before treating you need to (1) determine the volume of your pond with a meter; and (2) identify what parasite is causing the problem. Do not rely on estimating the volume by doing calculations based on pond dimensions. It always seems to result in major errors. Remove all the water from the pond and filters (and the fish, too, of course). Then check your home water meter reading. Re-fill without using any water for anything else. When you are done, your home meter will give you a reliable volume measure. [In other countries water may not be metered, so this technique does not work.] Remember to dechlorinate and use an ammonia binder if you have chloramine in the tap water. To diagnose the fish, you really need to take mucus scrapings and view under a microscope. You may have access through your work. For koi health issues, I recommend koivet.com. Lots of useful information there. Some very knowledgeable people frequent that board and they love to help. Better, check the AKCA website and locate the club nearest to you. Many clubs have Koi Health Advisors who do tremendous volunteer work helping people. If work etc permits, you may well end up with a home visit by a KHA who can help you figure out your situation.
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