Clorox Germicidal Bleach is EPA-registered to kill more organisms than original Ultra Clorox Germicidal Bleach. The EPA only requires a sanitizer to kill Salmonella typhi to pass the food-contact sanitizer test. Clorox Germicidal Bleach goes one step further with claims on both E. coli and listeria in addition to salmonella. With the dosage requirements for general disinfection cut in half, Clorox Germicidal Bleach provides better value. Moreover, ergonomically enhanced packaging is easier to pour, handle, carry and store. The concentration level is 8.25 percent.