All closed circuits undergo an oxidation phenomenon which results in the formation of a more or less thick brown to black material. Conventional sludge removal solutions are often complex to implement and do not stop the phenomenon of corrosion. The chemicals used are very aggressive for the systems and for the environment. This is called “sludge” which is made up of different elements of the system: oxidized metals, proliferation of bacteria, algae. These suspended solids (suspended solids) which charge the heat transfer fluid lead to poor heat exchanges and obstructions in the circuits of equipment holes. These disorders have the effect of increasing consumption and maintenance costs.