This is a new filter and does not contain any bacteria.  
Exceptional foam sponge quality supports efficient bio-filtration.
Large surface area supports increased beneficial bacteria populations.
Helps break down aquarium waste and remove suspended debris.
Ideal mechanical and biological filter for small-to-medium tanks
 
Aquariums: Up to 75 gallons
Sponge dimensions: 4"H x 4.5"D
Filter Height 8"
 
 
Important: Requires an air pump, airline tubing, and/or powerhead for operation (sold separately).