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Parameter limiting values for quality measurement (Qi) calculation [5].
| qi | E.C (μs/m) | SAR ((mmol L−1)0.5) | Na (meq/L) | Cl (meq/L) | HCO3 (meq/L) |
|---|---|---|---|---|---|
| 85–100 | [200,750) | [2,3) | [2,3) | [1,4) | [1,1.5) |
| 60–85 | [750,1500) | [3,6) | [3,6) | [4,7) | [1.5,4.5) |
| 35–60 | [1500,3000) | [6,12) | [6,9) | [7,10) | [4.5,8.5) |
| 0–35 | EC<200 or | SAR<2 or | Na<2 or | Cl<1 or | HCO3<1 or |
| EC≥3000 | SAR≥12 | Na≥9 | Cl≥10 | HCO3≥8.5 |
