This Cool Shirt maintenance additive has been developed by Cool Shirt technicians as a way of cleaning the Cool Shirt and Cool Vest systems. This non-toxic, biodegradable solution contains a fungicide, and yet is safe to use in all Cool Shirt cooling systems. Regular use of Cool Shirt maintenance additive will not only help clean the system, but it will also improve the performance and life of the system pump. Use 2 oz. of solution every time a system is used and 6 oz. for the large Multi Person Systems.