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All new biological formula with BioBlastPlus™ odor control technology that performs without fail in all temperature conditions. 1 Packet treats 40 gallons in both black and gray tanksKeeps your holding tanks clean and odor-freeChemical-free and accepted at all campgrounds, RV parks and RV/Marine dump stationsSafe to use in all septic systemsWill not harm children or petsFresh and clean scent