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Table 1 Classification of water corrosion potential based on the calcite saturation indices values and recommended treatments

From: Assessment of scaling formation during solar desalination using PHREEQC modeling in El Gebail and El Qaa plain areas: southwest Sinai

Saturation indices (SI) Description General recommendations
−5 Severe corrosion Treatment recommended
−4 Moderate corrosion Treatment recommended
−3 Moderate corrosion Treatment recommended
−2 Moderate corrosion Treatment should be considered
−1 Mild corrosion Treatment should be considered
−0.5 Mild corrosion Treatment probably not needed
0 Balanced Treatment typically not needed
0.5 Some faint coating Treatment typically not needed
1 Mild scale forming Some esthetic problems
2 Mild scale forming Some esthetic considered
3 Moderate scale forming Treatment should be considered
4 Severe scale forming Treatment probably required
5 Severe scale forming Treatment required