The correct options are
C Addition of tulasi leaves
D Adding camphor
Drinking water supplied to home is either surface water or groundwater. Most of these sources of water are not safe for drinking without proper treatment. This is due to the presence of microbial and chemical pollutants. Hence, traditional methods of obtaining potable water are boiling, exposing it to sunlight, adding Tulasi leaves, adding camphor to name a few.
Sedimentation and filtration are the different stages of modern water treatment process.