Most sand source in the river of sediment transport processes, but because for many years the exploitation of river sand was decreased year by year downward trend, so a lot of sand enterprise favor in the sand of the sea. But because of the sand in the years of water erosion, making the content of chlorine ion is far greater than the construction industry with the standard size of the sand. Only use sea sand desalination equipment, constantly cleaning the sand of the sea, to sea sand content of chloride ion will be reduced to the standard specified.

In a variety of fresh water washing machine, spiral can will be as much as possible sand fine particles retain, and corresponding guarantee sand production, and to ensure that the sand grain ratio. However, due to its own conditions, for high mud content of the sea sand can not be removed. It needs to wash the sand equipment based on spiral, increase other sand cleaning equipment, used to remove the residual chlorine ion and clay in the sand of the sea.