Yes - they are salt water, and just like a day at athe beach, you will probably want to shower off after you go in one. They have showers on deck next to pools. I recommend that you keep your suit on to take the shower, you get all the salt off that way. (though I once actually saw an elderly lady showering nude on deck).
I am the editor, but I also speculate, ask questions and play devil's advocate. I reserve the right to change my mind.