The Circa Las Vegas Casino in downtown Las Vegas is set to open on October 28th and will feature a multi-level pool amphitheater. Calling it the Stadium Swim, the pool will be open 365 days a year and overlook the downtown Las Vegas area as well as the Strip. The venue will also feature Ultraviolet Ligh sanitation and water-recirculation patterns, according to a release. Developers said this will provide guests with “the cleanest and healthiest public pool experience in Las Vegas.” There will be six pools and two spas. Each body of water will be a different temperature ranging from…