If the tank is accessible from the inspection cap, clean the dirt deposited inside with a wet sponge. Rinse the tank and empty. Fill the tank with a quantity of Steril Tank proportional to the tank capacity, in the measure of 50 ml of product for every 20 liters of tank capacity.

Then fill the tank with fresh water, open the taps and keep them open until the water starts to come out.

Let the solution stand for at least 24 hours. Finally, empty the tank and rinse it thoroughly with fresh water. It is advisable to periodically clean the fresh water tank.