Drilling fluid formulations are commonly mixed with various shearing devices which may be either fixed speed or variable speed. The motors may turn mixing shafts with rounded “propellers,” sharp blades, wave-form shapes, or others. Single shaft or multiple shaft devices are used. Some examples of the more widely used mixer types are: Hamilton BeachTM mixer, DispersatorTM high shear mixer, Waring BlendorTM mixer, Multi-MixerTM Model 9B mixer with 9B29X impeller, SilversonTM Model 14LR mixer. Stainless Steel 32 oz Mixer Cups No. 205967 are included with Hamilton BeachTM Mixers.