Realplus 3.8” Long Large Aquarium Filter Media, 100Pcs Ceramic Bio Media Blocks For Sump Tank Pond Fish Tank

Feature Size Of Each Block: 3.8” X 1.18” X 1.18” Large Surface Area: Covered With Thousands Of Porous Tiny Holes Provides Large Surface Area For Bio Filtration Dual Purpose Filtration: Serves Mechanical Filtration To Catch Fine Particles And Biological Filtration Effectively Absorbs Fish Waste And Debris Crack Into Pieces To Any Size Needed Great For Used In Freshwater Aquariums, Planted Aquariums, Sumps And Ponds Not Suitable For Saltwater Aquarium Package 100 X Aquarium Filter Media