The only thing about pottassium is the problem of possibly overdosing. The RDA for K is 3600mg a day for 2000 cals.
The one thing to remember is that potassium is kinda "balanced" by sodium. In other words, it doesn't take as much K to overdose if your Na intake is low than if your Na intake is more reasonable. They tend to balance each other.
Heck 7000mg of Na is very bad for you, but if you take 6000mg of K along with it, you're fine.
Taking 6000mg of K a day when you take in only say 2400mg of Na is a recipe for big trouble, too.