Catalyst or component ‘B’ for the CONVAR 2K or the BAR-MASTER 2K. Add at the rate of approximately 2 oz per gallon. Products can be re-inoculated an additional time after 24 hours to eliminate waste of catalyzed product. This is extra catalyst. CONVAR 2K and Bar-Master 2K both come with recommended dosage of catalyst on purchase. You would purchase this material to “re-catalyze” products.