Marine Pure Biofilter Media

The MarinePure GEM is about ¾“ diameter part that will be the perfect biological media for canister filters, hang on the back and nano-tank systems up to 70 gallons. The GEMs have the same porosity as our popular MarinePure SPHERES. Their unique combination open flow porosity and high surface area means one box of these little beauties is packed with over 1,450 Square Feet (135 Square Meters) of accessible Surface Area. They will be the perfect solution for ammonia and nitrite elimination, and most users will also see better control in Nitrates.
Micro filter size comes with around 12 gems. We recommend 4 gems per 40oz micro tank, or 10 for 1 gallon Small-In-One. 
Why Use MarinePure?
Better value due to high performance
Reduced tank maintenance
Allows for higher fish loads
Can use a smaller filtration footprint
More consistent water chemistry
Easy to shape