Compare distillation and membrane processes such as reverse osmosis for desalination.

Common trap

Confusing Distillation and Reverse Osmosis: Do not treat this as a general statement about desalination. Instead, answer by clearly linking the correction to compare distillation and membrane processes such as reverse osmosis for desalination in Potable water. This keeps the response inside Using the Earth's resources and obtaining potable water and prevents a vague or off-topic GCSE answer. The mistake to avoid is: students often confuse the processes of distillation and reverse osmosis, thinking they are the same method for desalination.