Procedure
- Take three clay pots.
- Put too small hole at the bottom of all pots.
- Arrange these pots on a stand.
- Put washed gravel in the topmost pot.
- Put sand in the middle pot.
- Put burnt coconut shell in the lower pot.
- Place a clean vessel under these pots.
- Muddy water poured into the uppermost pot and collect pure water from the last vessel
OBSERVATION
Muddy water poured into the uppermost pot become purified
Findings :
This is very simple method to purify water