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In the article there are considered the approaches to the hygienic assessment of efficacy and safety of chemical water disinfectants. On the basis of the own research of efficiency, with taking into account the reactivation of microorganisms, toxicity, impurity content, the processes of transformation of disinfectants, as well as the literature data there were developed the sanitary-epidemiological criteria for the assessment of the efficacy and safety of water disinfectants. These criteria include: the intensity of efficiency and time of exposure, the degree of universality of the action in relation to microorganisms, afteraction, lack of promoting of microorganisms tolerance, the ability to comply with the MPC after disinfection, the impact on the organoleptic properties of water, the probability of formation of hazardous transformation products in water, the presence of available and selective method for the determination in water, the possibility of neutralization, safety in use, transportation, storage.

Water samples and surface swabs from 15 Moscow public indoor swimming pools (SP), where disinfection was carried with the use of chlorine reagents, were studied and excess of bacteriological indicators standards was revealed, infestants of fungous skin and nails diseases were allocated. The research results showed both the absence of epidemic significant information value of bacteriological indicators in relation to infestants of fungous diseases and discrepancy of efficiency of existing recommendations for disinfection actions to requirements on providing sanitary-and-epidemiologic safety of SP visitors.

The method of photometric detection of metacide in the air is based on the interaction of latter with p-nitrophenyldiasonium in borate-buffer solution. The measurement takes place in 10 mm-basins at the wave-length 540 nm. The lower limit of detection is 0.15 mg/mm when 167 L of air are analysed.