The EHEIM Activated Carbon Pad Classic Series is a high-quality chemical filtration pad designed specifically for use in EHEIM Classic canister filters. Infused with premium activated carbon, this pad helps remove dissolved organic waste, medication residue, chlorine, and discoloration from aquarium water, resulting in clearer, fresher, and healthier water conditions. Ideal for both freshwater and marine aquariums, it is most effective when used after treatments or during water polishing phases. The pad is pre-cut for a perfect fit, offering easy installation and reliable performance, supporting overall filtration efficiency and maintaining a stable aquatic environment.