FloraBase is a patented, scientifically formulated substrate produced from natural volcanic ash-based soil, sintered with other minerals into a soft, porous, granular structure.12 poundsFloraBase contains all of the nutrients required by plants for proper development, guaranteeing ideal (natural) conditions for lasting plant growth. The soft, porous, granular structure is easily penetrated by growing roots, positively anchoring plants to the substrate while providing immediate access to all of the nutrients.FloraBase is an excellent filter media when combined with an under-gravel filter. The unique structure of the FloraBase granule enables it to actively absorb floating substances, removing cloudiness from the aquarium water.FloraBase will also act as a pH buffer, maintaining a stable pH between 6.5 and 7.0, which is ideal for almost all aquatic plants.