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| Q. |
When the hardness and alkalinity are around 30% what should be used? |
| A. | sac |
| B. | wac |
| C. | wac, sac |
| D. | wac, sac, wba |
| Answer» C. wac, sac | |
| Explanation: when the hardness and alkalinity are around 30%, then wac and sac should be used. wac removes temporary hardness caused by alkalinity. sac removes ema and alkalinity. | |
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