The Precision Fuel PF&H Electrolyte Tubes PH1500 are high-strength, low-calorie hydration tablets designed for athletes with high sweat and sodium losses. They contain 1,500mg of sodium per liter when mixed with water, along with other electrolytes like potassium, calcium, and magnesium, to help maintain hydration before, during, or after intense exercise. The tablets are effervescent, have a mild citrus flavor, and are typically dissolved in water to create a hypotonic drink that promotes rapid water absorption.