What precautions should parents take for children who swim a lot, particularly those on swim teams? Is there a higher incidence of chlorine-related health problems among swimmers? Does sunblock prevent the skin from absorbing chlorine?Updated: October 2009Chlorine used to disinfect swimming pools is widely recognized as a health hazard. New research suggests that children who swim frequently in chlorinated pools may have increased risks of developing allergies or asthma. Among adults exposure to