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[Efficient filtration] Made of high-quality materials such as natural coconut shell activated carbon and ion exchange resin, this filter can efficiently reduce chlorine, rust, limescale and deposits based on tests by a third party laboratory, ensure the purity of drinking water to the highest extent and improve the taste of the water. [Long service life] This filter has a long and stable filtration performance. To ensure efficient filtration, it is recommended to replace the filter when the filter capacity has reached 150 liters. [Good Compatibility] This filter is very easy to install, no tools required. Due to its exquisite design, this filter has good compatibility and allows you to enjoy fresh water at ease. [Compatible Model] Replacement for espresso machines with Aqua Clean Filter СA6903/00, CA6903/01, CA6903/99, CA6903-00, CA6903-01, CA6903-99, CA6903 cartridges. [Reminder of replacing filters] The visual time window on the cap allows you to monitor the life of the filter in real time and remind you of a timely replacement. Note: Soak the filter in water before use to ensure that the filter is completely submerged in water for a few minutes until there are no bubbles.