Spa Mineral Stick Specifications: Capacity: Up to 500 gallons. Lifetime: Four months,minimum 4 hours daily. Flow rate: Works with all spa flow rates. Installation: Drops into the core of most spa sticks, works with suction-side and pressure-side stick. Fuction:The hot tub stick can significantly improve the look and feel of the water, ensuring that the odor-free spa brings you clear water. Wide application: the hot tub stick is 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. Easy to install The spa mineral stick is not affected by heat and can be installed at your existing flow rate. Just put the spa stick into the existing filter and let the new stick work. Natural mineral Assures an odor-free spa,improves performance of spas,bring you crystal clear,clean and fresh smelling water without harmful chemicals. Suitable for most spas and hot tubs 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.