The AquaClear Filter Insert provides large surface area to screen out fine particulates of dirt and debris.  This unique filter foam features optimal pore size, for efficient biological filtration in combination with mechanical filtration, helping create and maintain a clean and healthy aquatic environment.
 
Sizing:
20 Gallon: 5-20 gallon aquariums
30 Gallon: 10-30 gallon aquariums
50 Gallon: 20-50 gallon aquariums
70 Gallon: 40-70 gallon aquariums
110 Gallon: 60-110 gallon aquariums