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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