Silk Balance is one of the most ingenious products I have used in quite some time. We have used many different chemical combinations for our spa, but this product is the easiest and has proven to be of great quality. I have sensitive skin and it is wonderful not to be exposed to the harshness of so many of the chemicals necessary to keep our spa in condition. I no longer must shower thoroughly and moisturize after spending time in the spa. Thank you for this time saving and wonderful product. Sincerely: Suzanne and Larry Messick