जल निकाय में विसर्जन से पूर्व सीवेज के किसी उपचार की आवश्यकता नहीं होती यदि तनुकरण गुणक (dilution factor) हो:

Turbidity in water is measured on which standard scale?

Mudball formation in rapid sand filters is the result of:

In a water sample, if 2 mg of platinum cobalt salt is dissolved in 1 litre of distilled water, then the colour produced is equal to: