How many bathers can I safely have in my spa?

Consider this: 2 bathers in a 400- gallon spa are roughly equivalent to 150 people in a 30,000 swimming pool. This significant bather load can decrease the sanitizer levels very quickly. For this reason, the standard for public spas or hot tubs is one bather per 10.8 sq ft of surface area. Properly sanitizing, balancing and shocking will help to ensure that everyone can relax and enjoy their hot water experience.