The Fauna Marin Multi-Filter is a versatile media chamber that can be used as a bio-pellet reactor or media reactor. As media reactor, the Multi-Filter can hold various types of filtration media: Fauna Marin Carb L activated carbon Fauna Marin NPO Redu pellets Fauna Marin Phos 0,04 Fauna Marin Power Phos Fauna Marin Ultra Phos You can also comfortably mix Carb L and PO4 media together in one chamber without any issues. The Multi-Filter's space saving design allows for users to find a spot for it in even the smallest of spaces! Product Specifications Multi-Filter 1.5 Liter Dimensions: 9.4" x 5.5" x 13.8" (L x W x H) Capacity: Approximately 1.5 L Includes: Multi-Filter 1.5 L and controllable pump Multi-Filter 3.0 Liter Dimensions: 9.4" x 5.5" x 19.7" (L x W x H) Capacity: Approximately 3.0 L Includes: Multi-Filter 3.0 L and controllable pump Tank