This product works by recycling cooling water from the 60 litre drum. As the water will get warmer during the distillation process a tank of at least 60 litres is needed along with 3 or 4 large ice blocks (e.g. 4 Litre Fruit Juice Bottle of Frozen Water). Add the ice blocks 1 at a time until they melt. Please note: The still pictured is for illustration purposes only and is sold separately.