Aqua-Kem Toss-Ins are quick-acting holding tank treatments that come in easy-to-use water-soluble packets. Simply toss one into the toilet and flush. These water-soluble packets dissolve fast to deliver great deodorizing power and cleaning action.• 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• Deodorizes the holding tank and eliminates offensive odors• Water-soluble packets break down fast• Comes in a 12-pack resealable bag• One 1.5-oz. Toss-In treats a 40-gal. holding tank Liquefies waste & breaks down tissue fast to prevent clogging Works around the clock in all weather conditions One 1.5-oz. Toss-In treats a 40-gal. holding tank | Thetford Aqua-Kem Toss-Ins Holding Tank Treatment, Fresh Scent, 12-Pack