Lees Filter Saver BagLees Filter Saver Bags are reusable, fine mesh filter bags that feature a drawstring for easy and secure bag closure. Use bag to hold carbon, ammonia remover, or any other filter media or resin. Reusable, fine mesh filter bags Saves filter media Helps prevent damage to equipment Lees Filter Saver Bags help prevent costly damage to the power filter motor when being used in backpack filters. Also can be used to bury media in the gravel in undergravel