Safety Material: These well-designed spa mineral bars are made of high-quality ABS plastic, which is sturdy and odorless. The minerals it contains will not cause any harm to the human body, so please feel free to use them. The minerals in the SPA mineral bar can effectively absorb some impurities in the water, creating a better and safer water environment for you to enjoy your SPA. Easy to Install: The hot spring mineral rods are not affected by heat and can be installed on existing waterways. Simply place the spa wand into your existing filter and let the new wand do its job. Natural Minerals: Ensure your spa is odor-free, improve its performance, and achieve crystal-clear, clean, and fresh water without harmful chemicals. Suitable for Most Spas and Hot Tubs: Suitable for jacuzzis, inflatable bathtubs, alcove bathtubs, walk-in bathtubs, whirlpool bathtubs, spa boats, and standard bathtubs. The easiest to use, installs in seconds. Ideal Choice: Our spa wand spas can hold up to 500