Marineland Replacement Bio-Wheel for Penguin 99B / Eclipse System 3 / Eclipse Hex 5 / Corner 5 / Eclipse Explorer creates beneficial bacteria on the dense surface through its rotation. As water flows, the Bio-Wheel eliminates ammonia and nitrite on contact.

• Irregular rotation of the Bio-Wheel is also normal
• Discoloration of pleated Bio-Wheel material is normal and desirable
• A Bio-Wheel rotating at any speed is working to eliminate toxic ammonia and nitrite

Dimensions: 2"L x 2"D

Note: Marineland Bio-Wheels should not be replaced unless damaged.