Natural waters

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