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Q. |
For minimal eye irritation, pH value of swimming pool water should be in the range |
A. | 6.2 to 6.8 |
B. | 6.5 to 7.0 |
C. | 7.0 to 7.2 |
D. | 7.5 to 7.6 |
E. | None of the above |
Answer» D. 7.5 to 7.6 |
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