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Disinfection of swimming pool water is necessary for reducing the risk of disease transmission. Disinfection by-products form when chlorine reacts with organic matter contained in water. More than six hundred disinfection by-products have been found in swimming pools. Trihalomethanes, haloacetic acids, chloramines, halonitromethanes, haloacetonitriles and nitrosamines are among the most frequently occurring. Disinfection by-products may be toxic. The volatility of some of them causes their occurrence in the surrounding air and poses a risk not only for swimmers, but also for people in the vicinity who are not in direct contact with the water. DBPs enter human body by inhalation, absorption through the skin and ingestion. They have been linked to health problems such as skin and eye irritation, bladder cancer and respiratory diseases. Preventing their occurrence is not an easy task; a number of factors play a role in their genesis (the amount of organic matter, type and the amount of disinfection, the quality of source water, temperature, pH) and not all principles of their formation have been fully clarified yet. Further research on DBPs and their sufficient regulation are important steps to maintain chemical safety in swimming pools. Key words: disinfection by-products, swimming pool,...

Due to anthropogenic impact, surface water sources are subject to intensive growth of phytoplankton communities. This poses a problem for water treatment, not only because water contains a large number of algae cells, but also because of the high concentrations of algal organic matter (AOM). These substances are characterized by low removability during the conventional water treatment process by coagulation, and therefore the increase in AOM removability is currently being researched. Oxidation pretreatment before coagulation is one of the methods that increase the effectiveness of algae and its excreted matter's removability. This work researches the influence of oxidation treatment on AOM removability by coagulation, and on treated water quality. The literary research has shown that pre-oxidation is rather ambiguous in terms of AOM coagulation. From one point of view, with the correct calibration of operation conditions, a right choice of oxidation process and the optimum oxidant dosage it is possible to achieve an effectiveness increase of partial AOM removal (e.g. cyanotoxins, taste and odour compounds and low molecular weight compounds with the help of mineralization). Pre-oxidation, however, can impair AOM coagulation by transforming high molecular weight compounds into low molecular weight...