Passage: Fresh water aboard Queen Mary 2 is supplied by three seawater desalination plants. The plants, each with a capacity of 630,000 litres (170,000 US gal) per day, use multiple effect plate (MEP) distillation technology. The plants' energy is supplied primarily by steam and cooling water from the ship's gas turbines and diesel engines, or if needed by steam from the ship's two oil-fired boilers. The traditional multiple-effect distillation technology has been improved for the ship's plant, so that scaling of plates is reduced, vastly reducing maintenance required. The desalinated water has a very low salt content of less than five parts per million. Average total water production is 1,100,000 litres (290,000 US gal) per day with a capacity of 1,890,000 litres (500,000 US gal) so that there is ample spare capacity. The ship could easily be supplied by only two of the three plants. Potable water tanks have a capacity of 3,830,000 litres (1,010,000 US gal), enough for more than three days of supply. If the engines are running on low load (when the ship is running at a slow speed) the engine jacket cooling water temperature is insufficient to heat the seawater to run the desalination plants. In that case steam from oil-fired boilers is used to heat the sea water. This is uneconomical as generating steam is expensive. It may be cheaper, therefore, to buy water in a particular port than to produce it on board. The seawater intakes are located in the hull of the ship. Concentrated salt solution (brine) is discharged to the sea closer to the ship's stern together with cooling water from the engines. An additional plant was added during the 2016 refit.

Question: What is the term for a concentrated salt solution?
brine