| Q. |
The hardness limit for portable water ranges between |
| A. | 10 - 50 ppm |
| B. | 50 - 65 ppm |
| C. | 75 - 117 ppm |
| D. | 150 - 250 ppm |
| E. | 300 - 700 ppm |
| Answer» C. 75 - 117 ppm | |
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