Classica Super Grade Activated Volcanic Lava:
Possed of super porous cell structure that provides large surface area for nitrifying bacteria More Effective compared to similar filtration mediums Superior Mechanical and bio-logical filter medium for any types Economical for larger filtration systems Classica Super Grade Activated Volcanic Lava possessed of super porous cell structure that provides large surface area for nurture of gentrifying bacteria. Resulting in outstanding filtration results. Numerous times more effective surface area as compared to similar filtration mediums.Superior mechanical and biological filter medium suitable for any pond / tank filtration systems. Economical for larger filtration systems.