Switching this year from usual camping in france to a package holiday. Most of the hotels we are looking at seem to have salt water pools which we've never encountered before. What are these like? I'm imagining water as salty as the sea dumped in a pool? Bit worried as last year, my youngest got a nasty heat rash that would sting if he went in the sea so he spent the whole holiday in the pool instead and that'll be no good if the pool is just as salty.