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| Q. |
Which material is used for removing fluorides from hard water containing 3ppm of fluorides? |
| A. | lime |
| B. | copper sulfate |
| C. | synthetic tri-calcium phosphate |
| D. | bone charcoal |
| Answer» A. lime | |
| Explanation: lime is suitable for removing fluorides from hard water containing less than 4ppm. magnesium is also removed when this material is used for defluoridation. | |
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