Purdue University, was awarded a grant of $75,000 as the first step in a three-year program to research combined UV and chlorine swimming pool water disinfection methods. The research will examine the effects of combined treatment on water and air chemistry in chlorinated, indoor pool settings. The grant, managed and administered under the NSPF industrial research grants category. The goal of this work is to give industry, regulators, facility operators and management a better understanding of swimming pool disinfection byproduct chemistry and technology options for their control, including Cryptosporidium inactivation. In turn this information will be helpful in reducing human exposure to DBPs in recreational water facilities.