MICRO-GEL is a bentonite product designed and engineered for microtunneling and tunneling applications. It is engineered to promote low fluid loss and increased lubricity, which translates to low jacking pressures. The integrity of the tunnel wall is maintained by the effect of the superior filter cake and gel strengths exhibited by the MICRO-GEL fluid. Uniquely, MICRO-GEL can be used both as the slurry fluid, carrying the cuttings away from the cutter head, and the lubricating fluid. Each function will necessitate a different mix ratio, but the contractor using MICRO-GEL needs only one bentonite product on location. MICRO-GEL mixes easily through most conventional mixing systems.