Materials Required:

A sample of muddy water, 3 containers, muslin cloth, alum, heating device

Procedure:

Take the sample of muddy water and filter it using a piece of muslin cloth.
Take a piece of alum and tie it with a thread.
Hold the thread and swirl the alum in water 2-3 times. This helps in settling down the fine mud particles suspended in water, which could not be removed by filtration.
Leave the water undisturbed for some time. Observe the change in the transparency of water.
Now decant/filter the water using a clean piece of muslin cloth.
Boil water for about 15-20 minutes to kill the germs.
Cool and filter the water again.
This is your clean water.

Drag the muslin cloth to the top of the empty beaker
Drop the muslin cloth to place it above the beaker as a cover
Drag the beaker containing muddy water to the top of the empty beaker
Drop the beaker to pour the muddy water through the muslin cloth
Click on inference button
Click on the next button
Drag the alum with thread to the top of the beaker containing muddy water
Drop the alum with thread so that the alum is immersed inside the beaker
Drag the muslin cloth above the clean empty beaker
Drop the muslin cloth to cover the top of the beaker
Drag the beaker containing water to the top of the empty beaker
Drop the beaker to pour the water into the empty beaker through the muslin cloth
Remove the muslin cloth
Click on inference button
Click on the next button
Drag the beaker containing water to the top of the wire gauze
Drop the beaker to place it above the wire gauze
Click on the burner knob to turn on flame ·
Click on the burner knob after the water boils to turn off the flame
Drag a new and clean muslin cloth to the top of the empty beaker
Drop the muslin cloth to cover the top of the empty beaker
Drag the beaker containing boiled water to the top of the empty beaker
Drop the beaker containing boiled water to pour the water through the muslin cloth
Click on inference button

Suspended impurities of muddy water are separated by filtration.
On leaving the water undisturbed after swirling with alum, the fine mud particles are settled down.
Depending on the degree of contamination of water it may take few hours to even a day or two for the particles to settle down.

Water can be cleaned with the help of simple processes such as filtration, treating with alum, boiling, etc.