This Package includes the media you will need for your JBJ Reaction Pro 2 RPC-175 Canister Filter for six monthly changes. It includes six of the Fine Filter Pads, six of the Coarse Filter Pads, and six of the JBJ Reaction Pro 2 Filter Replacement Activated Carbon. JBJ recommends you replace both Filter Pads and the Carbon monthly. It also includes a JBJ Reaction Pro 2 Filter Replacement 13W Lamp. JBJ recommends you replace the lamp every year.