An average bather generates 3 pints of sweat per hour. Because of this, it’s possible for only 2 people in a 400-gallon spa to deplete a bromine or chlorine level in just 15 minutes. In the absence of adequate sanitizer, certain bacteria populations can double every 20 minutes leaving the bather open to infection. Maintaining a proper sanitizer level and water balance will protect you and your family by making it a healthy and safe soaking environment.