Hatchwells Rock Sulphur is a water supplement designed to help keep animals cool during warm weather. It contains natural minerals that disperse into the animal's drinking water, aiding in cooling the blood. This supplement is suitable for a wide range of animals including horses, dogs, cats, and rabbits. To use, simply place a small piece of the rock sulphur in the water bowl and replace it every 2-3 days. This traditional additive helps cool animals by replenishing natural salts lost in hot weather.