These Bio-Wheels should not be replaced unless damaged. The water flow from your filter drives the Bio-Wheel. As the Bio-Wheel rotates, beneficial bacteria grow and thrive on its super dense surface. This bacteria 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.
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