Composting is a process in which, in addition to compost, large amounts of compost leachate loaded with inorganic and organic pollutants and microorganisms are produced, which must be removed before discharge into the environment in order to prevent pollution. In this paper, experiment with hybrid process of electrocoagulation with different natural zeolite particle sizes, for the treatment of compost leachate was carried out. During the experiment, changes in pH, electrical conductivity and temperature were monitored, and at the end of the process, chemical oxygen consumption (COD), turbidity, total solids and the mass of the precipitate were determined. Electrode consumption and suspension settling test after the implementation of the hybrid process were also examined. Results of pH and electrical conductivity have shown the biggest incline when using zinc electrode and larger current density. The highest COD and turbidity decrease is under conditions of smaller particle sizes and medium current densities. The consumption of the anode is higher than the cathode, which is expected, but the consumption of the cathode is especially visible with larger particles. The settling is very slow, which is a problem since no significant separation of the resulting precipitate from the solution has been achieved. The results of the calculated operating costs through Faraday's law and the reduction of electrode masses show significant oscillations related to the choice of electrode material, current density and particle size of natural zeolite.