Create a colorful aquascape in your aquarium with Marina Decorative Gravel. The gravel is epoxy-coated, which makes the gravel inert and prevents any adverse effects on water chemistry. Research shows that epoxy-coated gravel provides an optimum surface for the colonization of beneficial bacteria, which in turn provides biological filtration for clear and healthy water. The gravel is dust-free and is available in a wide variety of colors. For fresh water and saltwater aquariums. Colour: Purple. Size: 4-5mm (0.15"-0.2" ) Net weight: 450 g (1 lb)