Serious question. Is there any chance of ear infection due to the common water, rude people who have urinated in the tank, and the fact that your head is partially submersed?
The saline solution is basically very harsh to bacteria and other microbes. Besides that, UV cleaning is typically used on those kind of floating tanks.
At something like 6 lbs (2.7kg) per gallon (3.78541 liters) I'm not sure normal microbes can survive.
its not the normal microbes I am concerned about... its the invasive cockroach data dog type microbes that worry me
I was concerned/curious about that too - one place near me had a pretty good article on how they clean the water (my biggest concern) that was pretty interesting: