Natural hot spring experience: The natural hot spring mineral stick can automatically add trace minerals to the hot spring, reduce impurities in the hot spring, make the water clearer and cleaner, and make you as comfortable as in a pure natural hot spring EXTENDED LIFE: This Silver Nitrate Stick will extend the life of your spa and keep your crystals clean, leaving your spa crystal clear and fragrant, making your guests' spa experience unparalleled Existing for high cost performance: This hot spring silver ion bar is a product born based on market research and customer needs. The maintenance time is up to 4 months, and the maintenance cost is extremely low. It can be combined with your existing filters. Just put your hot tub wand into the filter. Enjoy 4 months of hassle-free SPA experience EASY INSTALLATION: This Silver Ion Barrel Spa Stick comes with a complete manual. The installation can be completed quickly according to the manual steps and is not affected by heat. It can be installed under existing traffic. Just put the spa wand into the existing filter and let the hot tub wand work Suitability: Minimum filter length required for spa hot tub filter mineral wand components is approximately 6.5 inches with a minimum filter pore size of 1-1/4 inches; suitable for spas and hot tubs up to 500 gallons/2000 litersMaterial: ABS+Minerals Product size: 3.2x3.2x41cm