Professional Design: The mineral material has strong adsorption capacity and can completely absorb the odor and heterochromaticity of heavy metals and water. Improve the performance of spas equipped with ozone and ensure an odor-free spa environment Multi-layer Filtration: Multi-layer filtration makes the water healthier and can effectively filter limescale, residual chlorine, red worm, rust and more. Hot tub spa filters can effectively inhibit bacterial regeneration. This spa mineral stick can greatly improve the appearance and feel of the water, ensuring that the odorless spa brings you clear water Healthy Water Source: Food grade mineral material has strong adsorption capacity and can completely absorb the odor and heterochromaticity of heavy metals and water, removing harmful substances to the body such as chloroform and other chlorine in the water Use for 4 Months: High quality is the perfect embodiment of safe and environmentally friendly raw materials, non-toxic and odorless, giving you a healthier life. Slides right into the spa filter, you won't have to check or change it for the next four months Suitable Environments: Hot tub spa mineral sticks are perfect for outdoor swimming pools, spa pools, bathtubs, hot tubs, deep pools and more and perfect for hot tub, inflatable bathtub, alcove bathtub, whirlpool bathtub, hot tub boat and most standard bathtubs Easy to use, install in seconds Note: The data are all measured manually, please allow 1-3cm error Due to differences in light and display, there may be some color differences, please refer to the actual item received.