The operation of thermal devices and installations, in particular heat exchangers, is associated

with the formation of various deposits of sediments, forming the boiler scale. The

amount of precipitate depends on the quality of the flowing liquids treatment, as well as

the intensity of the use of devices. There are both mechanical and chemical treatment methods

to remove these deposits. The chemical methods of boiler scale treatment include the

cleaning method consisting in dissolving boiler scale inside heat devices. Worked out descaling

concentrate contains phosphoric acid (V) and the components that inhibit corrosion,

anti-foam substances, as well as anti-microbial substances as formalin, ammonium chloride,

copper sulphate and zinc sulfate. Dissolution of the boiler scale results in the formation of

wastewater which can be totally utilized as raw materials in phosphoric fertilizer produc