Traditionally, we used to fill a kettle with tap water or water from a well and boil it.
Boiling may contaminate the water especially tap water. The residual chlorine in tap water will be converted into THMs a toxic material to health. Repeated boiling may make the situation worse.
In order to have clean and hygienic water, it is advisable to use a water filter to filter the water one more time before consumption or boiling. Normally a good water filter has the facility of boiling attached with it.
For further information on water filter, please visit http://www.the-coway.com.