. 2019 Apr 29;6:1021–1029. doi: 10.1016/j.mex.2019.04.027

Table 5.

Relative weight of chemical of physico-chemical parameters [1,9,17,21].

Number	Factor	Factor Weight	WHO Standard
1	K⁺	2	12
2	Na⁺	3	200
3	Mg²⁺	2	50
4	Ca²⁺	3	75
5	HCO₃⁻	2	500
6	NO₃⁻	5	45
7	NO₂⁻	5	3
8	SO₄²⁻	4	250
9	CL⁻	3	250
10	F⁻	4	1.5
11	TH	3	100
12	EC	3	1500
13	TDS	5	500
14	pH	3	6.5–8.5