Two Tornado Sticks. These are replacement cartridges specifically for the Science showerhead Mirable. They are compatible with Mirable Plus, Mirable, Mirable Zero, and Mirable ZERO. [New, Unused] The replacement目安 (estimated lifespan) is approximately 1 to 3 months. (The replacement目安 varies depending on frequency of use, water quality, and usage conditions.) The chlorine removal performance varies depending on water quality, temperature, and other conditions. * If the water temperature is high (exceeding 40 degrees Celsius) or the chlorine concentration is high, the replacement frequency will be shorter. They cannot be used with products from other manufacturers. # Science Science Mirable Tornado Stick x 2 Brand: Science