(2 Pack) Zoo Med Eco Earth Bricks. Zoo Med Eco Earth, a compressed coconut fiber expandable substrate that can be safely composted or recycled, is perfect for all types of reptiles, amphibians, small animals, or insects. Compressed brick will expand to make 7 to 8 liters of substrate.Made from an ecofriendly renewable resource.Naturally absorbs and breaks down odor and waste products.Use damp for tropical species, dry for desert species, or mix with an organic fertilizer for the perfect Vivaria soil.Instructions:Place brick in a pail, bucket, or sink. Add 4 quarts (3 to 4 liters) of water. Allow brick to expand for 20 to 30 minutes. Wring out excess moisture. For small animals, snakes and tarantulas use dry by leaving moist substrate out in the sun before moving to your animal's enclosure.