Desalination system could produce freshwater that is cheaper than tap water::A new solar desalination system takes in saltwater and heats it with natural sunlight. The system flushes out accumulated salt, so replacement parts aren’t needed often, meaning the system could potentially produce drinking water that is cheaper than tap water.
I believe most places pump in extra seawater to heavily dilute the brine, then release the extra-salty water over a wide area back onto the sea.
Yes, and that’s the lazy way of getting rid of it, and is ecologically devastating to the ocean. Israel has cause MASSIVE die offs by doing this with their large scale Desal operations, and plenty of info discussing it is online.