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Table 2 Hardness and related parameters in drinking water samples
| mg/L | μg/L | mg/L | μs/cm | |||||
|---|---|---|---|---|---|---|---|---|
| Well type | Na | K | Ca | Mg | Ba | Sr | Hardness | Condutivity |
| Abandoned wells in Sripura (n = 18) | ||||||||
| Mean | 74.8 | 0.9 | 51.8 | 28.0 | 150.7 | 572.4 | 243.6 | 877.2 |
| Median | 57.1 | 0.8 | 53.2 | 29.6 | 142.3 | 519.0 | 234.5 | 623.0 |
| Serving wells in Sripura (n = 16) | ||||||||
| Mean | 51.9 | 0.6 | 29.0 | 13.0 | 89.4 | 269.1 | 125.9 | 465.0 |
| Median | 38.6 | 0.7 | 28.5 | 11.6 | 83.9 | 265.0 | 121.0 | 509.5 |
| U | 77.5 | 97.0 | 26.5 | 24.5 | 64.0 | 31.0 | 6.0 | 44.0 |
| Z# | −2.295 | −1.629 | −4.054 | −4.124 | −2.760 | −3.899 | −4.762 | −3.450 |
| P Value | .0217* | .1034 | .0001** | .0000** | 0.0058** | .0001** | .0000** | .0006** |
| Surface water | 5.85 | 0.45 | 10.6 | 1.15 | 10.4 | 46 | 31.2 | 79.5 |
| RO water | 3.1 | 0.2 | 0.6 | 0.6 | 2.1 | 4.6 | 4.0 | 22.0 |
| Colombo well | 2.6 | 0.7 | 6.8 | 0.8 | 16.4 | 13.1 | 20.2 | 49 |
| Colombo main | 2.5 | 0.7 | 6.8 | 0.8 | 16.5 | 14.5 | 20.0 | 49 |
