Band 7+: Process Practice Task You should spend about 20 minutes on this task. The diagram below shows how salt is removed from sea water to make it drinkable. Summarize the information by selecting and reporting the main features and make comparisons where relevant.

The diagram indicates the technique of salt removal from seawater to make it consumable.

Overall, this approach is a complex process that consists of several stages. During that cycle, which begins at the seawaters, water passes through a pre-treatment filter and ends with the storage of drinkable water, while waste is removed to the sea.

Initially, saltwater is taken from the sea, and promptly undergoes a pre-treatment filter, which separates discharges back into the sea through pipes. Following this, the filtered water is forced through a membrane at high pressure, where water molecules pass through to another step, while other impurities and salt are washed back to the sea as concentrates.

At the final stage of the process of treatment, the filtered water goes through post-treatment, which involves lime, chlorine, and fluoride to make it consumable and to kill bacteria. After that, the water is stored and input to an integrated water supply system for consumers.