A really big desalination facility
A single nuclear power plant demands 8 desalinators worth of fresh water. Even with recycling water, it still comes to a lot of space and piping.
It gets even worse for large projects like, say, focusing on nuclear desalination for everything. Then you might have dozens of desalinators.
A large desalination module 4-8 times the capacity of the small one would be a nice improvement.