IELTS Examiner / Practice Prompt Bank — GT & Academic / Academic Task 1
IELTS Academic Task 1: Process Diagram — Water & environment
Original practice prompt written in exam style — not a real exam question, and not a prediction.
The diagram below shows how drinking water is treated before it reaches homes. Summarise the information by selecting and reporting the main features, and make comparisons where relevant. The process is as follows. First, raw water is pumped from a river or reservoir into a treatment plant, where it passes through screens that remove large objects such as branches and litter. The water then flows into a large settlement tank, where sand and other heavy particles sink to the bottom over several hours. Next, the water is passed through beds of sand and gravel, which filter out smaller particles. After filtration, a small amount of chlorine is added to kill bacteria and other micro-organisms. The treated water is stored in covered reservoirs, and finally it is pumped through underground pipes to homes and businesses. Samples are tested at several points in the process to make sure the water is safe to drink.
Examiner focus: A purification sequence — each stage removes something smaller than the last; end with storage, distribution and testing.
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