FloraBase is a patented, scientifically formulated substrate produced from natural volcanic ash-based soil, sinteredwith other minerals into a soft, porous, granular structure, FloraBase containsall of the nutrients required by plants for proper development, guaranteeingideal (natural) conditions for lasting plant growth, Its soft, porous,granularstructure is easily penetrated by growing roots, positively anchoring plants tothe substrate while providing immediate access to all of thenutrients, The unique structure of the FloraBase granule enables it to actively absorb floating substances, removing cloudiness from the aquarium, Florabase also acts as a pH buffer, maintaining a stable pH between 6, 5 and 7, 0, which is ideal for most plants, Lightweight substrate, 12 lbs bags fill equal to 20 lbs of regular gravel, No Rinsing required! 3-12 lbs bags per case, SKU: RYLHC4671