These tablets are EPA registered and are a great bleach alternative. They are effective against a broad range of microorganisms including C. difficile spores, Hepatitis B, Norovirus, Canine parvovirus and Covid-19. These are great for use in medical facilities and hospitals, schools and child care facilites, office buildings and cubicles, gyms, salons, industrial facilities and manufacturing plants, hotels, restaurants, food processing plants, etc. These tablets work with electrostatic sprayers, hand held trigger sprayers and course sprayers.