THey need to use this in swimming pools in place of chlorine. I hate chlorine.

This is fascinating. It sounds like it works for the same reason raw saltwater sushi is safe to eat. Humans are essentially freshwater organisms, and the bacteria or parasites present in saltwater fish simply explode in our bodies from the osmotic potential difference.
Although I would have my doubts about it being healthy for swimming-pool use. People's bodies are covered with benevolent bacteria as well, and immersing oneself in this water might kill off the good bacteria we need to out-compete invasive bacteria that cause infections and such. I wonder if they have those kinds of problems when using it to treat wounds. Hmm.

I don't think they have the same kind of problem when treating wounds. I think no bacteria at all is better when it comes to a healing wound.

Or you could put some maggots on it! :o