Tetra Whisper Bio-Bag Cartridge Conveniently Assembled and Ready-to-Use Three filters in one for cleaner water and healthier fish Like the unassembled, the-Packages are color-coded, making it easier than ever to remember which size to purchase Conveniently Assembled and Ready-to-Use Three filters in one for cleaner water and healthier fish Like the unassembled, the-Packages are color-coded, making it easier than ever to remember which size to purchase Please read all label information on delivery