AquaClear 70 / 300/A615 Replacement Carbon Bag Part # A617
 
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