Marine vessels use desalination plants to turn raw seawater into potable, or drinking, water. Through a process known as reverse osmosis, seawater is forced through a semi-impermeable that prevents salt particles from passing through. Raw water is separated forming a stream of highly concentrated brine and a stream of clean, desalinated water. The desalinated stream is treated with additional disinfectants before it is stored or circulated throughout the ship. Marine water supply networks transport treated water from on board storage tanks to water access points throughout the vessel – mainly washrooms, showers, and kitchens.