O i agree its common sense if u take the time to think about. Would you ingest copper every day for life? Why would u think fish would be any different. They swim breathe and eat copper 365 days a year so they become a ticking time bomb and baby koi it hits faster. Its a great product for pondless just not fish ponds. My old company i work for had one on their display pond and one day a fish kill all the 1" babies were first to go. Bottom line copper is no joke in backyard ponds.
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