Specially designed for Xiaomi Smartmi smart toilet, it effectively filters impurities above 5 microns to protect your health. Simple and easy to replace, comes with a special wrench. Features: 3PCS set only for Smartmi smart toilet seat standard edition.1PCS suitable for smartmi intelligent toilet all-in-one machine 2S / 2 andSmartmi intelligent toilet seat 2S / 2Pro. High-quality PP filter cotton can effectively filter impurities above 5 microns, such as sediment, rust, insect eggs, red worms, suspended matter, impurity hair, etc. Comes with a special wrench, making replacing the filter element as easy as twisting a bottle cap. Safe and environmentally friendly materials are selected, and the entire product has passed RoHS certification to protect the health of you and your family. The spiral model contains 3 filter elements. It is recommended to replace the inner element every 6 months, so that you can use it with more confidence. Specifications: Nut size: 4-point nut Maximum pressure: 0.75MPa Applicable temperature: 4~40℃ Card buckle size: 9.2x3.3 cm / 3.6x1.3 in Spiral size: 14.6x5.5cm / 5.7x2.2in Package list: Filter element x3 Wrench x1 Instruction x1