Handy and convenient, TST(tm) drop-ins are individual dose pouches that come in a resealable bag. One drop-in will treat your entire tank. Formaldehyde free. Dissolves instantly, eliminates odors on contact. 15 per bag.

 PROP 65 WARNING: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling. For more information, visit www.P65Warnings.ca.gov