All-Natural Stock Tank Defense®

No more scrubbing! Contains all-natural beneficial bacteria specially formulated for stock tanks. Keeps tanks clean and clear while improving water quality for fresh, healthy drinking water for livestock, birds, and wildlife. May require 4-6 weeks to achieve optimal water quality. For best results, do not use with chemicals and start with a clean stock tank. Includes six large sinking tablets. Each tablet lasts two weeks. Treats up to a 150-gallon stock tank for three months.