The diagram below shows how salt is removed from seawater to make it drinkable—Summaries the information by selecting and reporting the main features and making comparisons where relevant.
The illustration represents the process of making drinkable water from seawater by extracting salt and other impurities.
There are mainly four-stage stages to prepare drinkable water. The process begins with seawater from the sea and passes through a pre-treatment filter, where the filter backwash goes back to the sea, and the remaining water goes to the second stage.
In the Next stage, water is forced through the membrane at high pressure, and due to this, impurities and salt are removed, and only water molecules pass to the next stage. The seawater concentrate goes back to the sea. In the third stage, the water molecules get post-treatment with lime, chlorine and fluoride and then it goes to the last stage, which is storage and supply to the integrated water supply system.
The membrane, which is used in the second stage, has a series of small holes with such small dimensions that only water molecules can pass through it.
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