| >10,000 mg/L | Na+, Cl− |
| 100–10,000 mg/L | Ca2+, Mg2+, K+, Sr2+, Ba2+, SO42− |
| 1–100 mg/L | Al3+, Fe2+, Li+, borates, silicates, NH4+, HCO3−/CO32− |
| <1 mg/L | Zn2+, Hg°, Be2+, Co2+, Pb2+ |
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