Eco Earth Coconut Fiber Substrate is an all natural "green" product made from the husks of coconuts and can be safely composted or recycled into potted plants or gardens. Ideal for naturalistic terrarium type setups incorporating reptiles, amphibians, or invertebrates. Can be used damp for tropical species as it naturally absorbs and breaks down odor and waste products. Add Eco Earth Coconut Fiber Substrate on top of Zoo Med's HydroBalls to create an ideal drainage layer for optimum plant growth, humidity, and drainage in naturalistic terrariums. Each Eco Earth brick makes 7-8 liters of substrate.