Compatible with the Katadyn AC BeFree model. Filters up to 200 liters (per piece), depending on water quality. Stay prepared and ensure your water is always safe and great-tasting Keep your Katadyn AC BeFree water filter performing at its best with this high-quality replacement set. Specifically designed for the newest version of the BeFree system, components that help maintain optimal filtration performance and water quality during all your outdoor adventures. Activated Carbon Filter: Enhances the taste and smell of your water by reducing chlorine and other contaminants. Ideal for ensuring a refreshing drinking experience wherever you go.