> Flow has more healthy minerals than most bottled waters, and it's NATURALLY alkaline (pH of +/- 8.1). That means our minerals come from the earth, not an artificial process. That also means Flow's naturally occurring magnesium, calcium, bicarbonate, and potassium are amazing for your health. It's like the difference between organic and conventional—Flow is the organic avocado of hydration.
There's no such thing as "minerals coming from the earth": magnesium is magnesium, no matter how you're creating it.
How do you know if you're in need of a good source of electrolytes?
If you are about to do the same workout that causes the above, its a good idea to imbide them beforehand instead.
You pretty much need to go out of your way to not consume any of those essential electrolytes. SI can't really imagine that strenuous exercise shouldn't deplete electrolytes unless it's for a really long period in hot conditions.