Marineland Carbon Bag 4 count

The Marineland Reusable Universal Media Bags are designed to hold a variety of media, including K2 biological media for beneficial bacteria in both saltwater and freshwater aquariums. Compatible with most external and canister filters, simply fill the bag with your media, pull the drawstring for secure closure and place in the media basket or tray. Reusable, simply dispose of old media, rinse and refill with fresh media.