These Pads Are Compatible  Replacement Filter. 
High Quality  , Performs Mechanical Filtration ! 
Provides Efficient Water Flow With Less Clogging 
For Long Lasting Filtration.
Enhances Biological Filtration , 
Good For Freshwater & Saltwater Environments.

1 x NITRAX Nitrate Sponge ( 1 Pcs )Size  95 x 95 x 50 mm