(a)[1]
Desalination turns sea water into drinking water. What is desalination?
(b(i))[1]
Phosphates and nitrates often pollute river water. Give the source of these two pollutants.
(b(ii))[1]
Name one environmental effect brought about by these pollutants in river water.
(c(i))[1]
Describe how insoluble solids are taken out of river water.
(c(ii))[1]
State the substance used to remove unpleasant tastes and odours from river water.
(c(iii))[1]
State the substance used to disinfect river water so that it is safe to drink.