Crude salt is pre-washed in special washing system. This is then fed to the feed in hopper of the wet mill for grinding. Wet mill is used to grind the salt with the help of saturated brine solution. This mixture is then passed to the slurry tank that is fitted with a slow speed agitator. This slurry is then pumped through centrifuges gear pump to the wash tank by a slurry pump, wherein dirt is removed from the slurry.