Fluval C Series Filter Zeo-Carb. Designed for use with the Fluval C Series Power Filters, Fluval C Series Zeo-Carb is a premium blend of Fluval Carbon and Ammonia Remover that eliminate water impurities, odors and discoloration, while simultaneously removing toxic ammonia. Chemical filter media Frees up space inside the filter to include additional media if desired Helps create clean and healthy water conditions Convenient 3-pack format Available Sizes: C3 Zeo-Carb, 3 x 130 g (4.58 oz) C4 Zeo-Carb, 3 x 230 g (8.10 oz) Designed for the Fluval C Power Filters. The various filter media provides extensive 5-stage filtration, two mechanical, one chemical and two biological stages, for outstanding results. Foam pad is highly porous, with a large surface area that mechanically filters large particles and debris from the aquarium, creating for a healthy and clean aquatic environment and it slides out easily for quick cleaning. Poly/Foam Pad effectively performs the first and second stages of mechanical filtration. In stage 1, the porous foam side captures large particles. In stage 2, the dense polyester side traps finer debris. Activated Carbon provides superior adsorption qualities that effectively eliminate odours, discolouration and impurities. In the final two stages, a Bio-Screen pad provides massive biological surface area for friendly bacteria to colonize, plus it blocks debris from entering a trickle chamber filled with C-Nodes that are super-charged for fast and efficient nitrification. Fluval Zeo-Carb is a premium blend of research grade Fluval Carbon and Fluval Ammonia Remover. Working together, these highly effective media eliminate liquefied impurities, odors and discoloration, while simultaneously removing toxic ammonia, for a clean, healthy aquarium. Combining two products into one frees up space inside the filter for other types of media.