Disinfection of swimming pool water is usually done by:
AChlorine
BAlum
CUltraviolet rays
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Related Questions:
Removal of oil and grease from sewage is known as:
The organic impurities in water form a layer on the top of the filtering media. Such a layer called:
The organic loading in a trickling filter is measured in:
From septic tank the effluents are discharged into:
Which of the following has minimum detention period