The diagram shows us the process of how salt and other impurities are removed from seawater in order to make it safe for drinking.
In the first step of the process, seawater is extracted from the sea by the saltwater intake pipe and transported into a pretreatment filter tank. From there, the unusable water is sent back into the ocean by the filter backwash pipe, while the remaining liquid moves on to the next filter.
Following that, the saltwater is forced through a membrane at high pressure, which completely separates the water from salts and impurities; these are then classified as a seawater concentrate and spilled back into the sea. The usable water is then flowed into the next tank.
Subsequently, the next step takes place in the post-treatment vat, where the water is purified and detoxicated using lime, chlorine, and fluoride; after that, the clean water is moved to a storage tank and then poured into an integrated water supply system.
Overall, the purification of seawater consists of these main stages: Intaking, filtering and backwashing, separating impurities and salt, purifying, and then integrating into main water systems.