Isn't that hard on the filter and pump?
Or do they have a special type of system.
What about bacteria levels in a salt public pool?
Well, salt is sodium chloride, so in a way, it's just another way to chlorinate. I'm at the border of my knowledge here, but I'd imagine they have some kind of sand filter (just like my backyard pool has) to trap most of the particulates (bacteria, etc). I think they just pipe ocean water into their pool systems. Cruise ships also have salt water pools, not chlorinated pools.
Now that you mention it I was at my Art Dealers and noticed the filters he had from the Aquarium where he works are just like the filters in my pool.
Hmm interesting.
Got my brain thinking about this now.