Separation of water from salt by filtration

Answer: It is done by Reverse osmosis.

Filtration is a process used to separate solids from liquid. This process can be used to separate salt from water, although it is not the most efficient method. When separating salt from water, evaporation is the best method. This involves allowing the water to evaporate until only the salt remains. Alternatively, distillation or chemical separation using decanoic acid can also be used. Filtration can be used to separate solid particles such as sand from a salt solution, but it cannot be used to separate salt dissolved within water. The filtration process is simple and cost-effective, making it a popular choice for many applications.