| LSI | Indication |
| -2.0<-0.5 | Serious corrosion |
| -0.5<0 | Slightly corrosion but non-scale forming |
| LSI = 0,0 | Balanced but pitting corrosion possible |
| 0.0<0.5 | Sligthly scale forming and corrosive |
| 0.5<2 | Scale forming but non corrosive |
| LSI | Indication |
| -2.0<-0.5 | Serious corrosion |
| -0.5<0 | Slightly corrosion but non-scale forming |
| LSI = 0,0 | Balanced but pitting corrosion possible |
| 0.0<0.5 | Sligthly scale forming and corrosive |
| 0.5<2 | Scale forming but non corrosive |