摘要:Besides climate-realted elements, geographic characteristics, tourist factilities and traffic, cleanness of the sea plays the decisive role in choosing a destination at which to spend a holiday. Visual impression of the sea quality at bathing facilities is usually left to our subjective evaluation, but what one can actually find in the sea, and how dangerous it can be for us, we usually do not notice and are relatively unfamiliar with it. In a matter of fact, what we are so neglectful about, are microorganism that can have serious impacts on our health. In other words, quality of the bathing seawater primarily depends on their multitude.