Which of these is most likely to be a pollutant in agricultural waste water?

What is the name of the process used to purify water which involves boiling the water and then cooling it to condense the vapour?

Which process is used to make drinking water from sea water?

Which of the following substances is removed by filtration?

Which solute is present in the highest quantity in sea water?

What term is used to describe water that is safe for humans to drink?