The subject of the diploma thesis is to introduce the problems of communal spas, namely the treatment of water for swimming pools. Following is a proposal of reconstruction of the treatment plant for a real, operated area of the summer swimming pool. The thesis is divided into theoretical and practical part. At the beginning of the theoretical part I make research of the history of balneology, the effects of bathing and swimming on the human body, possible resources for spa purposes and hygiene requirements for these waters. I also describe commonly used methods of treatment of swimming pool water. In the practical part I first describe the summer swimming pool in the town of Břeclav. There is a description of the swimming pool, its history...