The Chief Waterworks Chemist, Mr Kelvin KWOK, says a chemical named alum can coagulate impurities in water to facilitate sedimentation. The picture shows alum is flowing into the raw water through the small holes of the pipe.
The Chief Waterworks Chemist, Mr Kelvin KWOK, says a chemical named alum can coagulate impurities in water to facilitate sedimentation. The picture shows alum is flowing into the raw water through the small holes of the pipe.
The Chief Waterworks Chemist, Mr Kelvin KWOK, says a chemical named alum can coagulate impurities in water to facilitate sedimentation. The picture shows alum is flowing into the raw water through the small holes of the pipe.
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