Camco's TST Blue Enzyme RV Toilet Chemical Drop-in contains a new bacterial/enzyme complex that will digest waste, tissue, fats and proteins and only activates in the presence of material requiring digestion. Unlike normal enzymes, this new chemistry provides a stable product with a long shelf-life that is not temperature sensitive. Each drop-in treats 40 gallons. It contains a buffer system to prevent acid formation as well as septic odors and has a Pure Rain fragrance. All components are biodegradable. It includes 10 drop-ins.