Water analysis accuracy tester

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Water hardness calculator

This calculator helps you determine the accuracy of your water analysis. The calculations are based on the principle of electro-neutrality. The principle of electro-neutrality requires that the sum in eq/L or meq/L of the positive ions (cations) must equal the sum of negative ions (anions) in solution, thus:

Ions	Concentration	Weight [g/mole]	Charge	mg/meq	meq/L
Ca²⁺		40,1	2	20,1
Mg²⁺		24,3	2	12,2
Na⁺		23,0	1	23,0
K⁺		39,1	1	39,1
HCO₃^-		61,0	1	61,0
SO₄^2-		96,1	2	48,1
Cl^-		35,5	1	35,5
NO₃^-		62,0	1	62,0

	meq/L
	meq/L
Percent difference	%
Interpretation of the percent difference

The acceptance criteria for the percent difference are as given below:

meq/L	Acceptable difference
0 - 3.0	± 0.2 %
3.0 - 10.0	± 2%
10 - 800	± 5%

The percent difference is calculated with the following formula:

Percent difference

The equivalent weight (g/eq or mg/meq) of a compound is defined as:

Equivalent weight=

where:
	M=	molecular weight, g
	Z=	charge

Remark: The table above shows only the ions that are usually present in tap water. If you have for example Silicates and Fluorides in your water, the judgment on the analysis accuracy is not totally correct.

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