Features of diagram/process/flowchart

• Category (stages/phases)
• Signpost
• Sequence: First, firstly, secondly,...
• Cause - Effect
• Condition
• Passive voice
• Time clause: after, before, when, as soon as, once, prior to, while,...
• Explanation: ... to ..., ... in order to ..., ... so as to ..., purpose, ... in order that ..., ... so as to ..., for ...




Sample:


The illustration shows the process of the removal of sea salt in order to get fresh and clean water. Overall, there are three main stages in the process from the initial unusable-water filtration to the final drinkable-water production.

First of all, the amount of raw water taken from the ocean is pumped into the filter. After that, the filter is backwashed and is then returned to the environment. After the removal of contaminants and undesirable components, the usable water is transported to the membrane which is considered as the most important area during the process.

In the second stage of the process, the water is filtered at the membrane under strict conditions such as high pressure. In addition, the structure of the membrane is extremely complicated with numerous holes whose diameters are fitted for the size of water molecules, which leads to the result that the salt molecules and impurities are restricted to pass through this layer, and are then returned to the ocean.

Before the storage and distribution, the filtered water is treated with some disinfectants including lime, chlorine, and fluoride which destroy bacteria and soften water. Finally, the freshest and cleanest water can be used after a wide range of careful steps above.