What is the ratio of Alum/Phosphate while adding alum to a waste water in order

Question

What is the ratio of Alum/Phosphate while adding alum to a waste water in order to remove the phosphates present?

Options:

A . 1.4:2.5

B . 1:2

C . 3:5

D . 5:7

Answer: Option A
Answer: (a).1.4:2.5

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