Precautions for replacing the PURE cabin filter:   Every 5,000 kilometers, a vehicle-mounted vacuum cleaner can be used to clean the dust on the surface of the filter. However, washing with water will destroy the electrostatic layer and cause the PM2.5 filtration efficiency to drop by 50%. When replacing, clean the air conditioner evaporator box simultaneously to avoid cross-contamination. Check whether the filter is frozen before use in winter. The frozen filter material is prone to cracking and failure. When a vehicle is parked for a long time, the filter should be removed and sealed to prevent moisture and mildew.