Filtration Control Agent FIL is a premium grade purified low viscosity, water-soluble ploymer, designed to control fluid loss while causes minimal increase in viscosity in 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 Recommended Treatment: Add Fluids Loss Control FIL in concentration of 2.0 to 5.5 kg/m³ (0.7 to1.9 lb/bbl) to any system. Mix slowly through a jet mixer or sift slowly into the vortex of a high-speed stirrer.