I got a 6 person Arctic Spa, used of course off some guy on craigslist who wasn't very smart and took a huge loss on a 1 year old spa Now I get to be the fish in my 400gallon spa! One of the great things about owning a hot tub is that you can buy all of your chemicals really cheap, just like Reefing(Clorox Bleach for sanitation, Muriatic Acid to lower PH, Baking Soda to raise it, Prestone Driveway heat to add calcium just like the fish tank, and Borox to soften it! I even use my American Marine Pinpoint PH monitor to test the spa's PH lol)