With the monsoon season in full swing most families in India will contemplate buying a water purifier to avoid the dark muddy water

This is true even as manufacturers of packaged drinking water have to meet stringent criteria outlined by the BIS.
A study carried out by Mishra on safety of storage water purifiers was commissioned by the NGO Healthy You Foundation. The study concluded that this market, especially the chemical purifier one, needs to be regulated.
S Krishnan, President of Healthy You Foundation, said the study had been sent to the Ministry of Health.
Source-Medindia