This patented formula is free of abrasive salts and is low in Volatile Organic Compounds, making it safer on your glass and friendlier on your environment. Res Gel comes in an innovative "Shake-a-Bag" resealable pouch, making cleaning your bowls, stems, chillums, and small accessories a breeze. Simply drop your small pipes in the reusable bag, or pour into your water pipes from the convenient spout.