[ECONOMICAL CHOICE FOR WATER QUALITY IMPROVEMENT]Salt system cartridges combined with the salt system of the hot tub can effectively reduce water hardness, reduce the formation of scale and sediment, and keep the bathtub water clear and transparent. [SCALE REDUCTION FOR LONGER SPA LIFE]By mitigating scale formation, our cartridges help prolong the lifespan of your spa and its critical components such as pipes and pumps. Enjoy more relaxation time in your spa with less downtime spent on maintenance and cleaning. [SKIN-FRIENDLY WATER FOR HEALTHIER SKIN]Experience the benefits of softened water that is gentler on your skin, reducing irritation and dryness while enhancing moisture retention and skin radiance. A year-long supply of three cartridges offers a sustainable skincare solution compared to quickly depleted topical products. [SIMPLE INSTALLATION PROCESS]Effortlessly install the cartridges by following our detailed video or pictorial guide. The tool-free installation can be completed within minutes, allowing you to quickly return to enjoying your spa experience. About this item [APPLICABLE] Compatible with Hot Springs Highlife Series, Hot Spring Limelight Series, Caldera Utopia Series and Caldera Paradise Series produced in 2019 or later. [ECONOMICAL CHOICE FOR WATER QUALITY IMPROVEMENT]Salt system cartridges combined with the salt system of the hot tub can effectively reduce water hardness, reduce the formation of scale and sediment, and keep the bathtub water clear and transparent. Each salt system filter has a service life of up to 4 months and does not need to be replaced frequently. [REDUCE EQUIPMENT MAINTENANCE TIME]Reducing the formation of scale helps to extend the life of the bathtub and related pipes, pumps and other equipment. Let you spend more time enjoying the spa instead of cleaning and maintaining the spa equipment. [MORE AFFORDABLE SKIN CARE]Softened water is gentler on the skin, reduces irritation and dryness, and helps to maintain the moisture a