Definition of Water Purification, Why do we need to purify water, will be answered. There are 3 main steps for Water Purification:

Explanation through a experiment.

Aim: To purify the given water.

Apparatus: Funnel, Glass beakers, bottle.

Materials: Filter paper, water, mud.

Method:

·         Take some muddy water in an old bottle, shake it vigorously, leave it for a  day.

·         Next day the water in the bottle can be clearly demarked as it's on the top and the mud and dust particles have settled (sediment) down. This is the 1^st step of water purification i.e. Sedimentation. Insert fig 1*

·         Now without shaking decant (remove) the water layer into a glass beaker. This is the 2^nd step of water purification i.e. Decantation. Insert fig 2 **

·         Now take a funnel and keep the filter paper in shape of cone, and filter the decanted water in another glass beaker. We will see that water gets filtered in the form of drops in this beaker. This drops together is called as filtrate and the dust particles remaining in the filter paper is called residue/impurities. This is the 3^rd step of water purification i.e. Filtration. Insert fig 3 ***

·         Note: # Besides the filter paper, sand, gravel, clay , cotton and cloth are also used as 

              filtering agents.

# The water still is not free from bacteria. These bacteria can be killed by adding

    KMNO_4., Chlorine tablets , Alum or by boiling.

Discovering Science - 4