The Fluval CHI Filter Media replacement combo pack includes 3 Chi Filter Pads and 1 CHI Foam Pad, exclusively designed for Fluval CHI aquarium filters, 19 Litre (5 U.S. gal.) and 25 Litre (6.6 U.S. gal.) sizes.

Features & Benefits:

• The 2-sided polyester/carbon Filter Pads provide thorough and effective mechanical and chemical filtration and are custom-sized to fit perfectly in the filter chamber to prevent debris bypass.
• The polyester side filters out debris and contaminants, while the carbon side filters out harmful liquid substances, colorants and odors.
• The Foam Pad captures excess particles and debris, plus it supports the growth of nitrifying bacteria for a healthy and clean environment.