Api pure laterite is an aquarium gravel additive made of 100 pure lateriter it is an all natural planting medium for aquatics plants we fully endorse the long term effects of laterite for explosive plant growthr for new set ups mix 1 oz of api laterite for every gallon of water into the aquarium substrater to jump start plant growth in an existing aquariarinse and mix api laterite around the roots and substrate of your existing aquarium plantsr notice the difference in six weeksr do no