In terms of annual tonnage, lime ranks first among water treatment chemicals. Lime is used for pH adjustment, phosphate removal, sludge and biosolids conditioning, and in association with other chemicals for precipitation. Lime is initially mixed with water in lime slakers to form a slurry referred to as slake lime. The slake lime is then added to raw water for formulation under carefully controlled conditions.
Often contained in an agitated tank, lime slurry is slightly abrasive, and can be corrosive depending upon the other chemicals involved. Contact level sensing should use single rod probes to avoid media buildup.