ABSTRACT
The surface waters of mountain reservoirs show very little contamination during stable weather conditions. However, contamination arises during heavy rain or snowfall. The contamination concentration parameters differ depending on different weather conditions in the reservoir area. A high level of variation in water quality indicates the need to include so-called ‘treatment barriers’ in order to stop and neutralize microorganisms, soluble organic matter and chemical micro-contamination (Sozan´ski 1984). The most effective processes in such conditions are preozonation, surface coagulation with flocculation on sand and anthracite filters, secondary ozonation and sorption on active carbon. It is important to carry out pilot tests because of changeable surface water characters, so that an optimal technical solution can be established as part of the water treatment process. The issue of pilot tests with different technical systems and filtration materials has been mentioned in the literature (Balcerzak & Łuszczek 2006, Johnson et al. 1995, Mołczan & Biłyk 2006, Sozan´ski & Olanczuk-Neyman 2002).
