【Highly Efficient Filtration】Made of high-quality materials such as natural activated carbon from coconut shells and ion exchange resin, tested by an independent laboratory, it can effectively reduce chlorine, rust, limescale, and sediment in the water, ensuring maximum purity of drinking water and improving the taste of the water. 【Long Service Life】The filter has stable and long-term filtration performance. To ensure effective filtration, it is recommended to replace the filter element when the filter capacity reaches 150 liters. [Good Compatibility] This filter can be installed very easily without tools. The filter is well-designed and compatible, allowing you to enjoy soft water without any hassle. [Compatible Models] Compatible with espresso machines with filters CA6903/00, CA6903/01, CA6903/99, CA6903-00, CA6903-01, CA6903-99, CA6903. 【Filter Replacement Reminder】 The visible time window on the cap allows you to monitor the filter life in real time and reminds you to replace it