A wastewater treatment plant is much less infectious than a septic tank. This is due to, firstly, the principle of smaller volumes of wastewater and smaller dimensions of the facility itself, and mainly due to the different processes occurring in both systems. In a septic tank, anaerobic processes take place, resulting in biomass, water and biogas composed mainly of methane and hydrogen sulfide, which are toxic gases and hydrogen sulfide also has a strong odor. Additionally, anaerobic processes minimally remove pathogenic microorganisms that can cause infectious diseases. In contrast, in an aerobic wastewater treatment plant, oxidation of water and all substances contained in it leads to their purification and simultaneous disinfection. It has been proven that 99% of all pathogenic microorganisms in raw wastewater are eliminated during the aerobic cleaning process in wastewater treatment plants due to oxidation. The final products of aerobic wastewater treatment, in addition to biomass are water and carbon dioxide, which are harmless and odorless gases. Furthermore, the system can be equipped with chlorine disinfection or a UV lamp for additional disinfection of the treated wastewater.