The use of high density bentonite slurry could improve trench stability. It helps to retain cuttings and particles in suspension and reduce the loss of bentonite slurry into soils of high permeability such as sand.
However, the use of low density bentonite slurry is desirable from operation point of view. Low density bentonite slurry tends to be more neatly displaced from soils and reinforcement. Moreover, the pumping of low density bentonite slurry is more easily to be carried out.
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This question is taken from book named – A Closer Look at Prevailing Civil Engineering Practice – What, Why and How by Vincent T. H. CHU.
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difference between density test and viscosity test