Advantages and Limitations of Iodine Disinfection of an Indoor Swimming Pool: I. Bacteriological Analysis

Abstract

Low-level and high-level iodine disinfection of the water of a large indoor swimming pool was studied, using a controlled swimming group. Under normal operating conditions, the group preferred iodine-disinfected water over chlorine-disinfected water. There was a marked diminution of the incidence and severity of eye irritation. There was a decline in skin irritation and ear infections when iodine disinfection was employed. Iodine disinfected water was bacteriologically and chemically satisfactory, but a gradual build-up of certain bacteria occurred when a cross-connection existed between the overflow gutters and the deck drains. The identity and significance of these bacteria, resistant to concentrations of halogens bactericidal to the standard indicators of pool sanitation, have yet to be assessed. In any event, the standard plate count serves as a valuable control for swimming pool water, and has advantages which should recommend its use in conjunction with the coliform and fecal streptococci determinations.