Table 6 Classification of water quality for industrial use
From: Assessment of water quality and suitability analysis of River Ganga in Rishikesh, India
| RSI | Inference (Ryznar 1944) | RSI | Inference (Carrier 1965) |
|---|---|---|---|
| <5.5 | Heavy scale will form | 4–5 | Heavy scale |
| 5–6 | Light scale | ||
| 5.5–6.2 | Scale will form | 6–7 | Little scale or corrosion |
| 6.2–6.8 | No difficulties | 7–7.5 | Corrosion significant |
| 6.8–8.5 | Water is aggressive | 7.5–9 | Heavy corrosion |
| >8.5 | Water is very aggressive | >9 | Corrosion intolerable |