Since Wyo-Ben Inc. introduced Tru-Bore in 1992, it has been the industry leader in HDD fluids. It is a highly concentrated bentonite-based drilling fluid that is extremely effective in difficult drilling situations from clay soils to sands and gravels. Tru-Bore is fast mixing, builds viscosity quickly, has low fluid loss and exhibits excellent gel strengths. These factors, along with being NSF certified, make Tru-Bore the best risk management tool available. Visit www.wyoben.com or call 406-652-6351.