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