Purchased new around March 2025, used for about six months, and the filter has not been replaced. I cleaned it regularly, but there are some marks. These marks are the nature of the product and appear after using it about twice from new, so I hope you understand. - Brand: Pigeon - Model: Bottle Sterilizer - Features: Includes a stand for sterilizing baby bottles - Control Panel: Digital control panel - Internal Structure: Hygienic internal design