Distillation- Is the process used to purify liquids by selective boiling followed by condensation.
Reverse osmosis- This is the reverse of osmosis. In osmosis movement of liquid molecule from its higher concentraation to low concentration through a semipermeable membrane takes place . Reverse osmosis is a filtration using semipermeable membrane which has small pores enough to pass pure water molecule and prevent the entry of solvents and bacteria.
Ultraviolet radiation- The water treatment to kill all the biological contaminants in water . In this treatment UV rays are passed over the water, UV radiations penetrates pathogens and kill them.
Chlorination- Chlorine is added in drinking water to disinfect it and kill all the germs present in it. As chlorine is a oxidizing agent, it penetrates easily inside the pathogens and destroys their enzymes and cell wall and makes the water pure and potable
