Over the summer the family took a trip to the Carribean for a week and my brother asked me to bring home some wet sand from the beach, So I brought home 2- 32 ounce bottles filled with wet sand from the water, I went out about 1/4 mile off shore to get it.the bottles weighted about 6-7 pounds each, suitcase weight problem yes, but I managed I gave him one and I keep one and added it to my display tank. Since then my sand bed has never stayed so clean, I use to stir it up a little once a week. Now I don't even touch the sand. Amazing how different the sand bed looks after a month and a half. Even the texture of the sand looks better. I might have to start doing this every time I hit the Carribean........