The pool in question is located within a family house located in the city of Porec. The pool has a floor area of 58 m2 , a depth of 1.35 m and a volume of 78.3 m3 . The aim of the main project of pool technology is to envisage a pool water preparation system that will meet the necessary conditions in accordance with the Ordinance on sanitary and hygienic conditions and the health safety of pool water (NN107 / 12) (Pravilnik o sanitarno tehničkim i higijenskim uvjetima te zdravstvenoj ispravnosti bazenskih voda (NN107/12)). This project includes the calculation and selection of equipment for the needs of filtration, chemical treatment, circulation, pool water heating and all the elements necessary for the smooth operation of the system. For the purposes of pool water filtration, a fast closed pressure sand filter made of glass-fiberreinforced polyester, designed for operating pressures up to max. 2.5 bar. It is equipped with fittings for manual operation - filter washing. The filter allows a filtration speed of v = 50 m / h for pool water filtration. Pool water is used to wash the filter. For the needs of pool water quality control, the installation of equipment for automatic measurement and regulation of the amount of free chlorine and the pH value of pool water is planned. The measured value consequently controls the operation of the dosing pumps for the chlorine solution, as well as the acid for lowering the pH value of the pool water. Also, with this work, the calculation of the total heat losses and gains of pool water was performed, on the basis of which the heating equipment was selected. Heat balance includes heat losses by evaporation, convection, radiation, transmission, losses due to fresh water supply and heat gains by absorption. Energy and economic analysis compared the use of solar collector systems and heat pumps. Based on the analysis, a system consisting of a heat pump and an additional electric heater for peak loads was selected as an economically justified investment for the needs of pool heating. Although solar energy is a natural, renewable and free source of energy, the high costs of the initial investment are often the reason for not using it.