At the end of this activity, students should be able to: û explain what hard water is, the causes and types of water hardness û describe the methods for eliminating temporary and permanent hardness from water û name the main water pollutants and the sources of this pollution û describe methods for removing water pollution caused by petroleum and petroleum products û name the main processes carried out during water treatment û describe the main steps in wastewater purification.

Originally released by Learnetic, 2016.