Product Easy to Use and Long Lifetime:Just simply drop the spa mineral stick into your existing device and let the hot tub stick do their work. Efficient Purification Effect:The spa minerals for hot tub can significantly improve the look and feel of the water, ensuring that the odor-free spa brings you clear water. PREMIUM MATERIAL: This hot tub mineral stick is made of healthy ABS plastic and natural minerals. Put it in the pool, it can keep the water fresh and clean for a long time, and enjoy healthy spa treatment at all times. Suitable for Most Spas and Hot Tubs: Perfect for jacuzzi, alcove bathtub, walk-in bathtub, whirlpool bathtub, hot tub boat and most easy-to-use standard bathtubs, just a few seconds installation. Package include:1 x SPA/Pool Filter Note: 1. Due to the different monitor and lighting effect, the actual color of the item may be slightly different from the color shown on the pictures. 2. Please allow 1-3cm error due to manual measurement. (1 inch = 2.54 cm) Thanks for your support :)