Chemical Process
Economics of 'Solvay Process' depends upon the efficiency of

Ammoniation of salt solution
Carbonating tower
Ammonia recovery and size of the plant
Ammonia recovery

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Chemical Process
Use of hydrated lime in water treatment

Before filtration, reduces the bacterial load on filters
Is to adjust the pH value
All of these
After filtration, combats the corrosive-ness of water due to the presence of O₂ & CO₂

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