Pre-Colonized With Beneficial Bacteria! All Inert Ingredients! No Fertilizer, Compost, Peat or Pesticides! 100% Natural Minerals! Kiln Fired! Ideal when potting aquatic plants Retains oxygen Enormous surface area perfect to colonize beneficial nitrifying bacteria Allows mixing any ratio of loam to planting media Nontoxic to plants Will not break down, float or cloud pond water Safe for all fish and aquatic life Available Sizes 10 lbs. (MLCAPM10) 20 lbs. (MLCAPM20) Contains no nutrients