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