Thetford Aqua-Kem Holding Tank DeodorantAqua-Kem is the #1 selling holding tank deodorant of all time because it does the job better than any other marine product: Powerful odor control; Liquefies waste and breaks down tissue fast to prevent clogging; Powerful detergents clean tank walls and drain lines; Works around the clock in all weather conditions; A variety of convenient forms for maximum ease of use; 100% biodegradable liquid and environmentally safe when disposed of properly;