Things that are required for playing hockey.

Which type of disease be cause when we drink polluted water?

The water received at the filter beds is sent to 

For purifying well water we can add which type of powder to the water?

Supplying pure drinking water in large quantities in villages and cities is called

Polluted water contain a harmful thing what is that?

Water is mixed with other impurities is called

Which chemical affect our nervous system?

The water doesnot harm us is called

By boiling water we kill