Name the steps taken to purify water in a municipal water - treatment plant .

Plants purify air during

Why do we add alum to purify water ?

Explain the three steps involved in the treatment of municipal waste water in effluent treatment plant prior to its disposal.

Alum helps in purifying water by

Soft water obtained on ion-exchange treatment

Soil water available to plants is

State the main steps to be taken to prevent water pollution.

Why KMnO_4 is added to purify drinking water ?

Name one water pollinated plant.

Ozone is used for purifying water because