From the caribsea catalog:
Eco-Complete™ Planted - Mineralogically complete! Contains iron, calcium, magnesium, potassium, sulfur plus over 25 other elements to nourish your aquatic plants. Eco-Complete™ Planted Aquarium Substrate contains all the mineral nutrients needed for luxuriant aquatic plant growth without nuisance algae! Iron rich Eco-Complete™ eliminates the need for laterite. No artificial dyes, paints, or chemical coatings. Highly porous spherical grains for optimum diffusion performance. Eco-Complete™ contains live Heterotrophic bacteria to rapidly convert fish waste into natural food for your aquatic plants. It establishes a natural biological balance; which makes cycling a new aquarium faster and safer.