Specifically designed for the Fluval U2/U3/U4 filters, BIOMAX provides an optimal environment for the colonization and growth of beneficial bacteria.
Features: 
- Biological filter media
 
- Complex pore system provides large surface area for beneficial bacteria
 
- Reduces and controls ammonia and nitrate
 
- Suitable for freshwater, saltwater or reptile environments
 
Compatibility: 
- U2 Underwater Filter
 
- U3 Underwater Filter
 
- U4 Underwater Filter
 
Item #: A495