In the UK most potable water is produced from fresh water. In some countries potable water is produced from sea water.
Compare the processes used to produce potable water from fresh water in the UK with the processes used to produce potable water from sea water.
40 exam-style questions on AQA GCSE Chemistry 10.1 Using the Earth's resources and obtaining potable water, covering 10.1.1 Using the Earth's resources and sustainable development, 10.1.2 Potable water, 10.1.3 Waste water treatment, and 10.1.4 Alternative methods of extracting metals. Each one has a worked solution and a mark scheme showing where the marks go.