Expiration Date: February 2027 Series Name: Mirable (Science) Brand Name: Science Product Name: Tornado Stick [Set of 3] Manufacturer: Science / Science Product Details: This is the Tornado Stick used with Mirable Plus. The replacement period for the Tornado Stick is approximately 3 months. The replacement period for the Tornado Stick is "3 months for a family of 4 using it daily (based on a water flow of 100L)". Therefore, if the usage frequency is low, the chlorine removal effect will last longer. However, depending on the water quality and temperature, it may expire earlier, or the white granules (calcium sulfite) inside may dissolve, harden, and weaken the water flow. In such cases, replacement is required even if the replacement period has not been reached. Please understand and use accordingly.