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Its a solution made up of water, Amonia-Amoniun chloride with Black T. Its used in the titration process, used to check the thickness of water.

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A certain amount of Carbonates of calcium and magnesium is usually present in water and this amount varies in different sources of water. In fresh water a little of these carbonates is present but in well water they are found in larger quantities. These compund interfere with the lather producing and cleaning action of soap. A soap is a sodium or potasium salt of long chain fatty acids like palmitic acid(found in palm oil).

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So its has disadvantages. That's why we used this solution to know the thickness of water, in case if it's too hard for use it's transferred to RO(reverse osmosis) Plants.