Hydrotem designed Hydro to ensure you get water effectively to achieve optimal performance. As a effervescent tablet that dissolves easily in regular water, it represents a very practical way (simply put one tablet in a 500 ml water bottle) without calories. Hydro meets your sodium requirements with a specific concentration (30 mmol/liter) scientifically proven to produce superior hydration compared to water alone. It was developed to keep the British sailing team optimally hydrated at the Beijing 2008 Olympics. Just drop a tablet into water for effective hydration, almost calorie-free, before and during exercise. Product features: • Simply drop into water to provide a high-electrolyte drink • High sodium content to help enhance hydration • When water is needed without added calories • Contents: 20 × 4.2 grams compressed