For optimum aquascaping, use 2 pounds of gravel per 1 gallon of water. Create your own unique aquascape using one or more colors. By combining colors you can create your own personalized mix to enhance or contrast your selected d‚cor. Natural underwater settings can be created by combining various colors and/or textures to create depth and contours.Instructions:rinse well in tap water to remove loose particles before use. Do not use soap, detergents or bleaches. Do not scrub or rub together.Spread gravel along bottom of habitat to create desired depth.Caution: Not suitable for children. Wash hands before handling.