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leakage - The presence of a consistent concentration of ions in the effluent of an ion exchange system due to incomplete removal of the ions; caused by incomplete regeneration, excessive flow rates, low temperatures, the concentration or characteristics of the influent ions, or other factors. (See hardness leakage.)
lime - The common name for calcium oxide (CAO); hydrated lime is calcium hydroxide, Ca(OH)2.
lime scale - Hard water scale containing a high percentage of calcium carbonate.
limestone - A sedimentary rock, largely calcium carbonate, and usually also containing significant amounts of magnesium carbonate.
liter - The basic metric unit of volume; 3.785 liters equal 1 U.S. gallon; 1 liter of water weighs 1000 grams.
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