Hygger 6.2-Inch Long Large Aquarium Filter Media, Ceramic Bio Media Blocks For Sump Tank Pond Fish Tank Media (7.9 Lbs,40-Pack)

[Dual Purpose Filtration]: This aquarium filter media serves mechanical filtration to catch fine particles and biological filtration for raising good stuff [Large Surface Area]: Premium ceramic media covered with thousands of porous tiny holes provides large surface area for bio filtration as well as filter out sparkling clear water [Crystal Clear Water]: Aquarium media block effectively absorbs fish waste and debris providing crystal clear water for fish to thrive [Valued Bulk 40-Pack Ceramic Blocks]: Each block measures 6.2 long 1.5 diameter approx 90 grams. Package includes: 40 packs ceramic blocks approximately 7.9 lbs in total [Wide Application]: crack into pieces to any size needed great for used in freshwater aquariums planted aquariums sumps and ponds. (PS: not suitable for saltwater aquarium)