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How Do I Clean My Pond of Possible Disease?

8 years ago

I have had an established 300 gal preformed above ground pond for several years. Nothing new was added, but 15+ inches of rain this spring. I started losing fish. I tested water, medicated, partial water changes, but nothing helped. Sadly I have finally lost the last one. I would like to drain & clean to possibly eliminate any disease before restocking, but what about my water lily & biological filter? How do I handle whatever germs could still be lurking in those? Thanks for your suggestions.

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