Just pirates and fisherman would be affected but they are salty to begin with.
No we're not, you bloody idiot!
Returns to mending nets and counting seagulls.
OP you replied to was saying the remnant waste brine from desalination may contain valuable lithium.
No, lithium is a mood stabilizer. It is mainly used to treat manic episodes in bipolar disorders and is not a particularly effective treatment for major depression.
I doubt drinking water contains anything close to therapeutic doses of lithium.