The system of a network of pipes used for taking away wastewater from homes or public buildings to the treatment plant is known as

Water polluted by various human activities causes a number of water borne diseases. Which of the following is not a water borne disease?

Pick from the following one chemical used to disinfect water.

Which of the following is a part of inorganic impurities of the sewage?

In a filtration, plant water is filtered using layers of