A swimming pool is an object with an artificially closed body of water that is used for sports, recreation and relaxation. They can be of different dimensions, and the only pool of standard dimensions is the so-called competitive pool. olympic swimming pools, 25 m wide and 50 m long. Nowadays, very popular swimming pool complexes mainly consist of a group of several pools, one of which is larger and the others smaller. Complexes usually offer numerous additional facilities such as saunas, jacuzzis, fountains, children's water park, sunbathing areas and the like. Public swimming pools are designed according to the DIN standard. It plays a key role in purifying, filtering and ensuring high quality water in swimming pools. In addition to water quality and sanitary-technical and hygienic conditions, the norms also define the design, operation and supervision of swimming pools. In accordance with the regulations, it is necessary to carry out regular water analysis. The quality of pool water needs to be controlled from a health, aesthetic and technical point of view, because healthy bathing water is one of the priorities in preventing water-borne diseases. The entire complex is made up of several components that play a very important role both in its functioning and in its maintenance. Every swimming pool must necessarily have an engine room or a filtration station, a heating plant, a ventilation system and pool technology. The term pool equipment includes a whole series of installations and devices that serve to maintain pool water. Their task is to keep the water clean, heat the water, control and regulate the pool systems. Pool complexes need to be regularly serviced and maintained, and numerous rules prescribed by law must be followed. In order for everything to function well, maintenance is carried out according to the precisely prescribed plan. In the practical part of the paper, I will present an example of the annual cleaning and disinfection of the sand filter for the Olympic swimming pool at the Svetice Swimming Pool Complex.