Intended for use as an effective regulator of the peological and filtration properties of clay and clay-free water-based drilling solutions. Depending on the viscosity and degree of polymerization, the product is produced in two grades: “LV grade” - (low-viscosity) is used to reduce the filtration of drilling solutions. “HV grade” - (high-viscosity) is used as a thickener for drilling fluids with a low solids content. It is the sodium salt of carboxymethylcellulose.