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- W2086541551 abstract "Abstract For disinfection of swimming pool water chlorine of chlorine-based products are normally used. In practice, these products have proven their worth regarding killing of pathogenic micro-organisms. Detailed values of their biocidal activity in swimming pool water were not found in literature. In the given study the efficacy of sodium hypochlorite (NaOCl) versus five micro-organisms was investigated. It is known that chlorination of swimming pool water may lead to formation of specific unwanted products like haloform. Nowadays, the concentration of those by-products in swimming pool water is limited and specific measures exist to minimize their formation. Nevertheless, there is increasing interest in alternative methods without by-product formation like e.g. hydrogen peroxide (H2O2) treatment. In the given study the antimicrobial activity of sodium hypochlorite was compared with that of different hydrogen peroxide-based products. The test procedure used was specifically designed to simulate practical conditions in a swimming pool but at the same time to lead to adequate reproducibility. Five test organisms were selected being relevant for the swimming pool area: Pseudomonas aeruginosa, Escherichia coli, Legionella pneumophila, Staphylococcus aureus and Candida albicans. The swimming pool water for the test was artificially prepared. Water hardness, temperature and pH value were adjusted to a defined level. Regarding simulation of organic load it was found that a mixture of urea, creatinine and several amino acids was most appropriate. Addition of the test organisms was done in three portions: one big in the beginning and two smaller after 10 and 20 min to simulate recontamination by bathers. Total test period was 30 min . The number of surviving cells was determined after 30 s as well as after 10, 20 and 30 min . Sodium hypochlorite was tested at a concentration of 1 ppm active chlorine. Compared to that three products based on hydrogen peroxide were investigated: pure hydrogen peroxide, hydrogen peroxide + silver nitrate and a trade product based on hydrogen peroxide. Sodium hypochlorite resulted in total kill of the inoculated organisms after 10, 20 and 30 min corresponding to a log 4 reduction. In contrast to that the biocidal effect achieved by the hydrogen peroxide-based products was significantly lower than one log cycle notwithstanding a very high concentration of up to 150 ppm . The test results confirm the very good killing activity of sodium hypochlorite versus micro-organisms relevant for the swimming pool area. Products based on hydrogen peroxide, with or without silver ions, are from a microbiological point of view no real alternative to chlorine disinfection in swimming pools." @default.
- W2086541551 created "2016-06-24" @default.
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- W2086541551 date "2003-06-01" @default.
- W2086541551 modified "2023-10-17" @default.
- W2086541551 title "Comparative assessment of different biocides in swimming pool water" @default.
- W2086541551 cites W2526529197 @default.
- W2086541551 doi "https://doi.org/10.1016/s0964-8305(03)00040-4" @default.
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