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Media Rods are suitable for freshwater and saltwater aquariums and ponds. Its stable chemical characteristics accord with the primitive living environment where micro-organisms live. The space structure is optimal for micro-organisms' colonization and growth. The multi-porous structure provides 6-8 times larger surface compared to other ordinary bio-rings. It's highly penetrative porous structure enables the aerobic nitrifying bacteria's nitrification and anaerobic denitrifying bacteria's denitrification. It is an ideal biological filtration material.