This document analyzes the operation of the ejector in the experiment station.The task was to analyse the ejector's functionality on three levels of water in the tank; then to measure the minimal flow for each of the three types of ejectors under which the suction of fluid would start to happen; and finally to measure the flow as a result of geometry change and to investigate the influence of suction depth on the behaviour of ejector. Following diagrams were made based on 215 measurements: pressure diagram, flow rate diagram, velocities at the entrance and the exit of the diffuser, suction depth, secondary fluid flow rate, total flow rateand the ratio of the secondary to the primary fluid flow rate depending on the diameter of the diffuser. The experiment determined that with the increase of the diffuser diameter, the pressure decreases and the flow rate increases while the fluid velocity at the exit of the diffuser is reduced. In addition to the diffuser diameter change, there is also an impact of geodetic height on pressure, flow rate and fluid velocity. The impact upon the functioning of the three different types of ejectors comes from the geometric shape of the ejector and the change of the diffuser diameter. On each ejector type, some similarities can be noticed between the diagram curves. There is a great influence on the secondary fluid flow rate, the total flow rate, and the ratio of the secondary to the primary fluid flow rate, which stems from the diffuser diameter change as well as from the change of the diameter at the entrance of suction pipe. During the measurement process it was determined that the impact on suction depth comes from the diffuser diameter change as well as from the change in geodetic height. It can be concluded that the greatest impact on the ejector's functionality comes from the change of diffuser diameter, the geodetic height, and the diameter of the pipe's entrance.