We have an outside hot tub at home and the last time we had it serviced the repairman and I were talking about public hot tubs, hotel jacuzzi's, etc. Here's what he told me........he and his wife were on vacation at a very large, exclusive resort (not Disney) and he decided one evening to use the jacuzzi....he said he of all people knows the bacteria and junk that can accumulate in the tubing and he doesn't know why he even turned the jets on......no junk came out so he got in.......they come home from vacation and a few days later he starts breaking out in this rash....within a day or so it's pretty much spreading He goes to his doctor who takes a scraping, puts him on antibiotics and cream and asks him where he's been......has he been in any public hot tubs, etc. When he told the doctor he had been in a jacuzzi in a hotel.........turns out he had a surface staph infection. So, folks, since I heard that........bleach definitely goes in the jacuzzi as soon as we get back from the grocery store. That way if we do want to use it.......I KNOW it's clean. At the risk of sounding disgusting..........would you REALLY want to take a bath with all the people who stayed in that room before you? That's pretty much what you're doing if you don't run something thru to sanitize the tubing and jets. Since bleach kills any kind of germ......that's my choice.