Compatible replacement granulated activated carbon (GAC) filter for the Mountain Fresh Underbench Reverse Osmosis Water Purification Unit (ROUB-B). This carbon filter effectively reduces chlorine, unpleasant tastes, odours, and organic contaminants, helping to improve the taste and quality of your drinking water while protecting the reverse osmosis membrane. Replace every 6 months, depending on water quality and usage. Easy to install and maintain for continued pure water performance. Code: CROUB-GAC-B