In a process of water disinfection it is necessary to distinguish between primary disinfection focused on removal or inactivation of microbiological contaminants from raw water, and secondary disinfection focused on maintenance of residual concentration of the disinfector in distribution system. Current practice related to disinfection follows two approaches. The paper presents results from a stage task solution “Research of physical-chemical changes in water quality during its distribution” at the Nová Bystrica-Čadca-Žilina long distance water supply system (LDWSS) focused on the presence of disinfection by-products by using chlorine dioxide.

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