Electrolyte replacement during exercise can vary as much as tenfold between two athletes. No other area of endurance nutrition or supplementation calls for such individualised dosing, and perhaps no other area of fueling can drop you out of the competition as quickly as electrolyte depletion or overdose. This is a critically important area where correct dosage is a must; you simply musn't consider getting electrolytes out of a premixed drink. The risk of too much fluid and too few electrolytes is high, which is not good for your stomach, muscles, or performance.
You want a product that allows effective electrolyte replenishment under any weather condition, any length of exercise, and any intensity of exercise. Endurolytes, unlike any other pill, tablet, or premixed drink, is that product. Also, don't make the mistake of thinking that electrolytes = sodium. Sodium alone cannot and will not effectively replenish electrolyte needs and may cause more problems than it resolves. With Endurolytes you're assured of getting all of the right minerals in exactly the right balance.