“…The introduction is carried out with the help of a gear-pump, which prevents premature destruction of molecules of DRP (Belousov, 1986). It is possible to use mixing of water solutions of DRP in a mixer with eccentrically arranged smooth working part (Orel, Pitsyshyn, & Popadiuk, 2019;Orel, Pitsyshyn, & Popadiuk, 2020) and to use a gear-pump as a mettering pump for DRP solutions at the expense of frequency regulation (Orel, 2017b).…”