What chemicals can be used in a fish pond?

Scooter

New member
Where we live, there is a fish pond that people can fish and swim in. But the landlord doesn't really know how to take care of it. One of the neighbors said that child got sick from swimming in it a couple of years ago. I don't know if it's true or not. The fish (catfish and carp) are doing fine in it. Is there any certain chemicals that can be put in it that will clean it and make it safe for people as well as the fish.
 
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