The information by selecting and reporting the main features, and make comparisons where relevant
IELTS Academic Writing Task 1 - Process Diagram

IELTS Writing Task 1 Question
The flowchart below compares three methods to recruit new employees. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

Common Questions for Process Diagram (Water Filtration Systems)
1. Graph Type: Process Diagram (Water Filtration Systems)
2. Title: Comparison of Two Water Filtration Systems
3. What are the units of measurement? No specific units of measurement (illustration of filtration steps)
4. Who: Water purification systems for household use
5. When: Not specified (general water filtration processes)
6. Where: General use (household settings)
7. Topic: Two water filtration systems used for purifying water
Comparison Showing and Trends Any change over time (such as an increase or a decrease) is a trend.
Comparison 1 : Basic Filtration System
- Details:
- The first system involves a 200-liter water container, where dirty water is sent through an inlet at the top. The water passes through three layers: sand, tiny stones, and pipes with holes. After filtering through these layers, the water is purified and fit for drinking.
Comparison 2 : Advanced Filtration System
- Details:
- The second system is more advanced, using two containers. The untreated water is first stored in a container with a tap, and then passed through sand in another container. After filtering through the sand, the water is stored again before being dispensed for household use.
Comparison 3 : Complexity and Purpose
- Details:
- The first system is simpler and directly purifies the water for drinking. The second system involves additional containers and filtration steps, and is designed to filter water for general household purposes, not specifically for drinking.
Sample Answer
The given diagrams illustrate the steps involved in two different water filtration systems. While both systems aim to purify water through filtration, they vary in complexity and the final use of the water.
Overall, the first system is simpler and cheaper, providing clean drinking water directly. While more advanced, the second system is suited for filtering water for general use rather than just for drinking.
The first system uses a 200-litre container to hold untreated water. The water is filtered in three stages: sand, tiny stones, and pipes with holes. Once the water passes through these layers, it is purified and safe for drinking.
The second system is more advanced and consists of two containers. The untreated water is initially stored in a container with a tap, and then passed through sand in another container. After being filtered through the sand, the water is stored again and used for general household purposes.
Top 26 Vocabularies
Vocabulary | Meaning | Synonyms | Examples | Type |
Filtration | The process of removing impurities from a liquid | Purification, straining | Filtration is the primary method for purifying the water in both systems. | Noun |
Inlet | An opening through which liquid enters | Entrance, input | The dirty water enters through the inlet at the top of the container. | Noun |
Tiny | Very small or minuscule | Small, minute | The tiny stones in the first filtration system help in further purifying the water. | Adjective |
Container | A receptacle for holding something | Vessel, tank | The water is stored in a container before and after the filtration process. | Noun |
Household | Relating to home or domestic use | Domestic, home | The second system is designed for purifying water for household purposes. | Adjective |
Purify | To make something clean or free from contaminants | Cleanse, sanitize | “The water is purified through filtration before being used.” | Verb |
Impurity | A substance that contaminates something | Contaminant, pollutant | “The impurities in the water are removed during filtration.” | Noun |
System | A set of components working together for a purpose | Setup, method | “Both systems aim to filter water but with different methods.” | Noun |
Stage | A particular phase or step in a process | Phase, step | “The water is filtered in three stages in the first system.” | Noun |
Water Source | The origin or supply of water | Supply, origin | “Untreated water comes from a local water source.” | Noun |
Advanced | More developed or complex | Sophisticated, improved | “The second system is more advanced than the first one.” | Adjective |
Water Treatment | The process of improving water quality for use | Purification, processing | “Water treatment ensures it is safe for general use.” | Noun |
Filtration Process | The sequence of steps to purify water | Filtration stages, cleaning process | “The filtration process involves multiple steps to purify water.” | Noun |
Sediment | Solid matter that settles at the bottom of liquid | Deposit, residue | “Sand and tiny stones help remove sediment during filtration.” | Noun |
Filter | A device used to remove impurities from liquid | Strainer, sieve | “The filter removes small particles from the water.” | Noun/Verb |
Layer | A level or sheet of material | Stratum, tier | “Each layer in the filter helps remove different impurities.” | Noun |
Tap | A device for controlling the flow of liquid | Faucet, spigot | “The water is dispensed from the container through a tap.” | Noun |
Clean | Free from dirt or impurities | Pure, clear | “The filtered water is clean and safe to drink.” | Adjective |
Untreated | Not having been cleaned or processed | Raw, unprocessed | “The untreated water must be filtered before use.” | Adjective |
Safe | Free from danger or harm | Secure, protected | “The water is safe for drinking after the filtration process.” | Adjective |
General Use | Water suitable for various everyday tasks | Household use, common use | “The second system provides water for general use, not just drinking.” | Noun |
Purpose | The reason for which something is done | Aim, goal | “The first system is intended for drinking purposes.” | Noun |
Remove | To take away or eliminate | Extract, discard | “The sand in the system helps remove impurities from the water.” | Verb |
Contaminate | To make something impure by exposure to harmful substances | Pollute, taint | “The water becomes contaminated if it is not filtered properly.” | Verb |
Supply | A provision or source of something | Source, reserve | “Water supply is essential for both filtration systems to work.” | Noun |
Process | A series of actions or steps taken to achieve a result | Procedure, method | “The filtration process involves several important steps.” | Noun |

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