Growstones have several advantages over other stones: They can be used for growing both fish and plants They are made from recycled glass They are durable They are easy to clean They come in various sizes They are dishwasher safe They are biodegradable Growstones are made from 100% recycled glass, and the material is durable and very strong. The pieces are also dishwasher safe, which is a huge advantage if you are cleaning your system often.