【Large compatibility】: Supports multiple brands of hot tubs and of spa lines, Compatible with hot-sprinsg, limeligth, Caldear Paradsie & Utoipia lines of spas manufactured since 2019 【ECONOMICAL CHOICE 】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. 【Specail compatible design] Our salt box is a product specially designedout of market research and customer needs. It lasts up to 4 months with minimal maintenance. It can be used with your existing filter. Simply place your hot tub stick into the filter and you can enjoy 4 months of worry-free spa experience! 【SKIN CARE MORE AFFORDABLE 】Softened water is gentler on the skin, reduces irritation and dryness, and helps to maintain the moisture and radiance of the skin. Unlike fast-consuming skin care products, three salt system cartridges can bring you a year of skin care. 【Product Details: Salt】1500-2000 ppm Hardness: 25-75 ppm Alkalinity: 40-120 ppm PH: 7.2-7.8 Chlorine: 1-5 ppm 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. 【EASY TO INSTALL】You can refer to the video or picture installation steps in our product details, and the installation can be completed in a few minutes without tools.INSTALLATION STEPS：1.Remove cap 2.Press the button to remowe thecartridge 3.Insert a new cartridge, press thebutton & push it into place 4.Secure cap, Followinstructionson the control panel INSTALLATION STEPS：1.Remove cap 2.Press the button to remowe thecartridge 3.Insert a new cartridge, press thebutton & push it into place 4.Secure cap, Followinstructionson the control panel Q：Will the chlorine produced damage my skin? A：Our salt cartridge hot tub features salt-generated chlorine which is safer than traditional chlorine products and is less irritating to the eyes and skin. A：What about product compatibility? Q:Supports multiple brands of hot tubs and of spa lines, Compatible with hot-sprinsg, limeligth, Caldrea Paradsie & Utoipa lines of spas manufactured since 2019. Q:installation troublesome? A:Our salt system cartridge have a convenient and low maintenance line system that is easy to replace in just a few seconds without tools.