Process Diagram

Band 6+: The diagram below showsthe process of filtering raw water using a slow sand filter.

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Image for topic: The diagram below showsthe process of filtering raw water using a slow sand filter.

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The image depicts the filtration process through a slow sand filter showing raw water entering the break pressure chamber, passing through 60-90 cm thick sand and 20-30 cm thick gravel layers with underdrains, and exiting as filtered water.

Given the complexity of the image, the above description may not be entirely accurate.

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The diagram provides how water is filtered by using a slow sand filter.

Overall, this process includes 3 main steps from the entrances of water then it is filtered by sand before becoming fresh water.

Taking the initial step, the raw water is going through the tube then it is contained by a break pressure tank. After that, the water flows to the second tank, where filtration mainly takes place. At this stage, it separates into two layers, first of which is sand with a thickness of 60-90 cm. For the better effect, after going through the sand layer, dirt and particles are purified by the gravel layer with a thickness of 20-30 cm.

Having been filtered, clean water is collected in underdrains connecting to another tank. This tank connects to a tube which allows filtered water to flow out. There, the water is stored waiting for users to obtain.

Word Count: 150

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Overall Band Score

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Vocabulary Complexity:
B1 - Intermediate
Using more sophisticated words could be beneficial.

Grammar Mistakes: N/A

Vocabulary Repetition:

water: 7

filtered: 4

Try using synonyms for the above words

Task Response

The report adequately describes the process of water filtration using a slow sand filter. The description is generally clear and covers the main stages of the process. To improve, consider adding more specific details about the purpose of each component and ensuring precise language throughout. For example, you could elaborate on the function of the break pressure tank and the specific role of the underdrains. Also, avoid using conversational phrases like 'Taking the initial step' to maintain a formal tone.

Coherence & Cohesion

The report is generally understandable, but the organization could be improved. The introduction is a bit too brief. Consider adding a sentence or two to provide a clearer overview of the entire process. The use of cohesive devices is adequate but could be more sophisticated to improve the flow between sentences and paragraphs. For example, using more varied transition words and phrases would enhance the connection between ideas.

Lexical Resource

The vocabulary used is adequate for describing the process, but there's room for improvement. Try to incorporate more specific and technical terms related to water filtration to demonstrate a wider range of vocabulary. For instance, instead of saying 'dirt and particles are purified,' you could use terms like 'sediment' or 'particulate matter' and 'undergo purification.' This would make your description more precise and sophisticated. Boost vocabulary complexity to elevate the overall score.

Grammatical Range & Accuracy

The report contains several grammatical errors that affect clarity. For example, 'The diagram provides how water is filtered' should be 'The diagram illustrates how water is filtered.' Also, 'entrances of water then it is filtered' is awkward; consider rephrasing it for better clarity. Pay close attention to verb tense consistency and subject-verb agreement throughout the report. Proofreading carefully for these errors will improve the overall accuracy of your writing.

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