The SpaPure C002854-CS20B1 1.5 lb Spa Water Softener Treatment is a one-time-use treatment for your spa that offers months of performance. Once added as directed, this pH-neutral treatment gives your spa water a soft, silky feel, and locks in alkalinity. Featuring a fresh fragrance and moisturizers, this formula works with all sanitizer and oxidizer systems and does not contain any oils or additives that clog filters.