Water hardness convert

Conversion of Water Hardness and calculation of the demand of Sodiumchloride for dehardening:

1. Enter a hardness value of your choice.

Dissolved alkaline earth metals form the hardness. Main contributors are Calcium und Magnesium. The dissociation forms of carbonic acid form the carbonate hardness. Total hardness usually is higher than the carbonate hardness as further anions (sulfate, nitrate and others) can also hold Calcium and Magnesium in solution.

Boiler scale consists mainly of a stable crystal form of calcium carbonate (Calcite). Scale occurs when saturation limits are exceeded. Less stable crystal forms like Aragonite are also possible.

Ion exchangers remove Calcium and Magnesium cations by substituting them by two Sodium ions each from table salt. Sodium salts stay in the water. Calcium- und Magnesiumchlorides leave the process with the effluent of the ion exchanger.

		Converions factor
Acid capacity KS4,3	mmol/liter mval/liter	1
Total alkaline earth metals	mmol/liter	0.5
Degree german hardness	°dH	2,8
Degree of english hardness	°Clark °e	3,51
Degree french hardness (Switzerland)	°fH	5 approximately
Calcium carbonate	mg/l	50
Hydrogen carbonate	mg/l	61