Drilling Viscosifier VIS is a premium grade purified high viscosity, high molecular weight polymer, used as an effective viscosifier and reduce fluid loss to water-based drilling fluids. Advantages: Effective in fresh water, salt water, and brine-based fluids Controls fluid loss Inhibits hydratable, swelling shale Environmentally compatible Does not require a bactericide Extends life of foam or stiff foam in air drilling Recommended Treatment: Add Drilling mud additives VIS in concentration of 1.4 to 5.7 kg/m³ (0.5 to 2.0 lb/bbl) to any active system. Mix slowly through a jet mixer or sift slowly into the vortex of a high-speed stirrer. Applications: Controls filtration rates Retards shale swelling and disintegration Rapid increase in viscosity