Hikari RIO+ Carbon Plus Pad is a multi-stage chemical and mechanical filtration media specifically formulated to remove impurities and improve water clarity in marine, reef, and freshwater aquariums. Designed to combine fine particulate filtration with high-quality activated carbon, it helps create the conditions required for removal of discoloration, odors, dissolved organic compounds, and medication residues while maintaining proper water flow. By removing dissolved waste before it can negatively impact water quality, it helps support balanced aquarium ecosystems and long-term aquatic health. Easy to cut, install, and replace, and precisely manufactured for consistent results, Hikari RIO+ Carbon Plus Pad helps maintain a stable aquatic environment where fish, corals, and other aquarium inhabitants can thrive.