Marine Pure High Performance Biofilter Media Sphere 1 Gallon 3.8 L
1½" Spheres are designed for Ammonia & Nitrite Removal under high flow. Deep pore structure will allow development of low oxygen zones, which will help with control of nitrates. One MarinePure Sphere has the same surface area as 1,350 plastic 1.5" bio-balls.
Can be used in canister filters, sumps & wet/dry filters.