In republic there are many concrete structures which are highly damaged by influence of concrete corrosion. This concerns in the first rate these structures which are exposed to weather effects, overloading and changes in using. This is action of water jet generated under the pressure of till 250 MPa by means special instruments when on the structure produces an imposed effect of direct impulse of pressure water and cavitation action. Except of High – pressure water jet (HWJ) the company must be equiped with building chemistry and shotcrete technologies. The character of such a company or group is in general specialised in building and must be completed with internal or external capacities in building diagnostics and projection design'. From the point of view of organisation it is necessary to incorporate the operation of HWJ agregates in order to correspond with the needs and objectives of the company.