Review on Hydroton Original Clay Pebbles Lightweight by Michelle Langley

Yes, there is some dust. Yes, most pellets float, but then again, I don't do underwater terraforming. They are reddish in color with a blackish interior. They come in a variety of sizes, allowing for tighter packing. Useful tip to remove dust and stop floating particles. Rinse the pellets, place the pellets in water in a pressure cooker/tin can and make sure the pellets can be submerged in the water. Cook under pressure/may take about 10 minutes. You can either let it cool or just release the pressure. The pellets float. Place the pellets in a container of clean warm water. 99.9% of pellets sink. Keep the pellets submerged until ready to use. Don't let it dry. Allow the granules to cool for about 15 minutes before use.