15. Which of the following chemical is sometime added in the process of coagulation and flocculation?
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16.
Which of the following physical method is used as germicidal in modern time for the treatment of drinking water?
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17. Sanitizer used specifically for vitreous enamel are
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18. The common methods used for disinfection in waste water treatment plants are
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19. Inhibitors are used along with sanitizer to
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20. Sanitizers used for rubber made equipments are
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21. Which of the following substances are commonly used in a filter?
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