I think the risk of the natural pools would be very close to the risk of high quality natural waters in that climate. And, the risk of those waters is not zero. Obviously, these pools are NOT sanitized.
But, a much greater risk than Naegleria would be person to person transmission of things like various viral infections, including hepatitis. Actually, in collecting research articles for SwimmingPoolResearch.com, I have discovered that spa or pool transmission of hepatitis, herpes and HIV have apparently never been ruled out. So, in using a natural pool, my biggest concern would be the health of those I was swimming with.
It makes me wonder how natural public pools could be justified, for high density bather loads. I have NOT seen any research on pathogens present in such pools, which does NOT reassure me.
Kelemvor, the pools I found seemed to be mostly in the UK or northern Europe, so they aren't dealing with South Beach or Louisiana-like climates. Before I'd put one in Florida, I'd want to see a few OTHER PEOPLE'S natural pools that had been operated successfully for 5+ years.
But . . . those those pools, and some others I'm going to post, are really beautiful. So . . . if it was just me and my wife, we'd love them!
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