To verify that this replacement coffee filter is compatible with your filter, please indicate the model number. This is for CA6903. Effective filtration: The ion exchange resin effectively prevents the formation of limescale. In addition, the advanced activated carbon derived from coconut shells can absorb residual chlorine, improving the taste of your coffee (tested by an independent laboratory). No limescale: There is no need to descale your coffee machine. This coffee machine filter prevents the formation of limescale by replenishing the calcium and magnesium ions present in the water, extending the life of your coffee machine by up to 3 months. Easy installation: You can install this filter without any tools. For detailed installation instructions, please refer to the instruction manual included in the package. Replacement models are: Coffee and espresso machines with Aqua Clean cartridges CA6903/00, CA6903/01, CA6903/99, CA6903-00, CA6903-01, CA6903-99, CA6903.