Recommended for this application is a vertical, center-mounted mixer with a 0.3 meter diameter, 4-blade, pitched-blade turbine, operating at 5 revolutions per second.  The impeller should be located 0.2 to 0.3 meters off the bottom.  The motor needs to be 1 kW or larger.

If the soap is less viscous at a higher operating temperature, four 0.07 meter wide, vertical baffles on the walls of the tank may be necessary to prevent uncontrolled swirling and to promote vertical mixing.

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