Suitable Environments: The water purifier is ideal for outdoor swimming pools, hot spring pools, baths, spa pools, plunge pools and many more and perfect for jacuzzi, inflatable bathtub, alcove bathtub, walk-in bathtub, whirlpool bathtub, hot tub boat and most easy-to-use standard bathtubs, just a few seconds installation. Health : The food grade mineral material features strong adsorption capacity and can fully adsorbing odors and heterochromatic from heavy metals and water, removing substances harmful to the body such as chloroform and other chlorine in water. For 4 Months: The high quality is perfect embodiment for the safe and environment friendly raw materials, non-toxic and no odors, giving you a healthier life. Drops Directly Into Spa Filter, you will not have to check or change it for the next four months. Multi-layer Filtration: The multi-layer filtration makes water more healthy and can effective filtrate scale, residual chlorine, red worm, rust and many more. The purifier can effectively inhibits bacterial regeneration.This spa mineral stick can significantly improve the look and feel of the water, ensuring that the odor-free spa brings you clear water. Professional Design Mineral material features strong adsorption capacity and can fully adsorbing odors andheterochromatic from heavy metals and water. Improves performance of ozone-equipped spas, and assures an odor-free spa environment.