A water treatment plant treating 10 mld of water requires 20 mg/I of filter Alum, Al₂ (SO₄)₃. 18 H₂O. The water has 6 mg/l of alkalinity as CaCo₃ (Al = 26.97, S = 32, O = 16, H = 1, Ca = 40, and C = 12).

Quantity of Quick Lime required (10⁶ mg per year as CaO) shall be

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