Filtration is a separation technique that uses a filter to separate particles of different sizes. The filter is a semipermeable membrane that allows smaller particles to pass through while blocking larger particles. In the case of salt particles, the filter would be able to separate the salt particles from the water in which they are dissolved. The water would pass through the filter, while the salt particles would be trapped on the filter.

Filtration is a simple and effective separation technique that can be used to separate particles of different sizes. It is often used in industrial processes to separate solids from liquids.