All our sand is not hazardous to the environment as it is a natural mineral and could be disposed of in your rubbish bins. It’s non-biodegradable, and it would not be decomposed by bacteria or other living organisms because it is SAND! It’s also safe to use outside, and dropping small pieces on the grass is not harmful and would not hurt your grass in small quantities. Just avoid a large amount of sand lying on the grass as it would prevent it from getting it’s needed oxygen and moisture. So either sprinkle outside or pop in the rubbish.