Thetford Aquabio 16 Ct Toss Ins. No formaldehyde no bronopol. Septic safe odor eliminator and waste digester. Features a pleasant citrus smell. Features of Thetford 96590 Aquabio 16 Ct Toss Ins Pleasant citrus smell Size: 16 count toss-ins Formaldehyde-free No Bronopol Package Contents: Thetford 96590 Aquabio 16 Ct Toss Ins Thetford 96590: Aquabio 16 Ct Toss Ins