Loosely Packed 2" Cubes.
MarinePure High Performance Biofilter Media MP2C 2 CU FT
Designed for Ammonia and Nitrite Removal. Deep pore structure will allow development of low oxygen zones, which will help with control of nitrates.
Loosely packed, the 2 inch cubes are specifically designed for the high flow of koi and goldfish ponds and recirculating aquaculture systems.
One cubic foot is good for 1,500 to 2,000 gallons of pond water