Hydroelectric energy is the main source of renewable energy in the world, because of this, the interest in the scientific field has been permanent. A hydraulic generation technology are pumps working as turbine (PAT). However, compared to other clean energy technologies, PAT technology has not found much literature in published academic research, contributing to its limited understanding of the academic community. This paper proposes the study of the highest incidence geometric parameter (inlet blade rounding) at the maximum efficiency point (BEP) of a commercial centrifugal pump. Using reverse engineering, geometric models of the impeller and volute were created. Its dynamic fluid behavior was then evaluated in pump mode, based on numerical-experimental studies. Validating the numerical method, the PAT behavior was determined with the same simulation methodology, thus obtaining the characteristic curve of the PAT. Later the impeller geometry was edited with the objective of implementing the blade rounding at the impeller inlet finding an increase of the power generated by the PAT in 3.142