How does a natural swimming pool remain swimmable without chlorine or other chemicals?

JR: Since the water in an NSP is neither disinfected nor sterilized by manmade chemicals, salt, or mechanical means, it’s understandable that a homeowner may be wary of the water’s safety. By purely organic methods, however, the water is cleaned because it is in constant motion as it passes through a biological filter and into the regeneration zone. (As the old saying goes, “still water runs dirty.”)
Plus, because the water is always moving, homeowners do not have to worry about mosquito infestation; mosquitoes prefer to breed in standing water.

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