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The article presents the formation and toxicity of trihalomethanes (THMs), substances belonging to Disinfection By- Products (DBP), formed as a result of pool water chlorination. Concentration of THMs in pool water has been standardised in Poland since recently. THMs concentration in pool water depends on multiple factors, mostly the method of water disinfection, including chlorine or organic substance (TOC) concentration. Apart from that, the level of exposure of swimmers to the toxic effect of THMs is affected by their content in the air of swimming pool halls, intensity of swimming as well as time of stay in the indoor swimming pool area. The water and air temperature as well as number of swimmers and time of their staying in pool have also significance influence on THMs concentration. In order to decrease the quantity of THMs in pool water, alternative disinfection agents are applied. Additionally, an efficiently operating pool ventilation system as well as proper water treatment method are also important. Because THMs are produced from organic material under the influence of the chlorination, the users can have an impact on decrease of the THMs concentration in pool water, for instance by taking a shower prior to entering the pool or by wearing a swim cap. The results of studies conducted in 2015 showed that the quantity of THMs in pool water depends on type of the pool (indoor, outdoor), water replacement frequency, water treatment system, chlorine dose and TOC content. In most collected samples, the THMs concentration exceeded the admissible norm (100 μg/L).
The studies included 10 public indoor swimming pools and 3 public open-air swimming pools located in the city of Szczecin. In 2003, water samples were collected for detection of virulent amphizoic amoebae strains. In all pools, 16 strains of thermophilic Acanthamoeba spp. were isolated, 5 of which proved virulent for mice. No pathogenic strains were detected in the water sampled in the indoor swimming pools, and the virulent strains, AD 16, AD 148, AD 166, AM 17, and AM 148, were found only in the open-air swimming pools. The post-mortem studies of mice that had been inoculated with these strains revealed the amoebae invasions in brain, lungs, liver, kidneys, and spleen.
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Swimming and bathing in Czechoslovakia until 1938

84%
Swimming and bathing in Czechoslovakia started to take shape at the beginning of the 19th century. At first, suitable locations in nature were used, with the first swimming baths built later on, primarily on rivers. The first competitive swimming races were held in 1845 on the Vltava River and in 1890, the AC Prague Sports Club founded a swimming department which also in-cluded competitive swimming races. In 1914, the Czech Union of Swimming was founded and in 1919 it was renamed as the Czechoslovak Amateur Swimming Association. The number of swimming pools at this time was very low, the conditions of Czechoslovak swimmers were not ideal, and their results at international swimming competitions suffered as a result.
Przeprowadzone badania wykazały, że wskaźniki fizyko-chemiczne jakości wody różniły się między sobą tylko w nieznacznym stopniu w badanych basenach kąpielowych i nie przekraczały dopuszczalnych norm. Największe różnice zaobserwowano w przypadku stężenia chlorków. Zauważono także, że niskiemu stężeniu wolnego chloru w jednym z basenów odpowiadał wzrost bakteryjnego zanieczyszczenia wody w 18% badanych próbek.
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