Depends on what you're trying to purify it from...
Chlorine is the element located in Period 3 that is used for water purification. It is also a member of the Halogen group.
Iodine - http://en.wikipedia.org/wiki/Iodine
chlorine is used in purification of water cl2.answer by harsh bharti ... email.krumpingkingharsh@yahoo.com
chlorine
Chlorine is the non-metal which is used for the purification of water
No, it is not. UV is used in it.
Reverse osmosis is used for water purification, such as in a water treatment plant.
Carbon filters are used for home water purification in homes because carbon is able to filter out may toxins that are harmful.
Purification
Chlorine is added to water to kill pathogens.
The most effective water purification system that can be used in a house is a UV light water filtration system. The UV light kills about 99% of all bacteria living in the water.
Water Purification tablets are tablets that you put into water and they clean the water