Aquaforest Air Scrubber Media is a specialized CO₂-absorbing medium designed to stabilize pH levels in reef aquariums. This white, dry pellet fills the filter chamber, allowing airflow while effectively absorbing carbon dioxide. Regular use and replacement of the media help maintain a stable pH, preventing harmful fluctuations caused by low water pH. The media changes color as it absorbs CO₂, serving as an indicator for replacement. It is recommended to replace the media before the color changes completely to ensure optimal performance. The media is single-use and should be replaced regularly for best results.