There are certainly algae formed due to the air permeability of the system, also favored by the water temperature on 35 to 40 °C. In such cases, it is necessary to clean the system with the broad-spectrum biocide THERMAKIL, circulating with special DISIFLUX pump with high head. It normally takes only 30 to 60 minutes to break down even the most stubborn forms of aerobic and anaerobic bacteria.