Abstract: A filter flushing adapter is provided for use with a filter device where the filter device has an opening forming an inlet and a second opening forming an outlet and with a filter medium positioned between the inlet and the outlet. The filter flushing adapter includes a body having a first open end leading to an interior passage of the body. A second open end leads to the interior passage. The second open end may have a connection fitting configured to receive the filter device and the first open end may have a connection fitting to receive an outlet of a kitchen faucet. An overflow outlet is positioned in the adapter between the first open end and the second open end communicating between the interior passage of the body and an exterior of the body and being aligned with the outlet of the filter device.