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Use of hydrated lime in water treatment
Options:
A .  before filtration, reduces the bacterial load on filters.
B .  after filtration, combats the corrosive-ness of water due to the presence of O₂ & CO₂.
C .  is to adjust the pH value.
D .  all (a), (b) and (c).
Answer: Option D
Answer: (d).all (a), (b) and (c).
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