FYI you don't need bacteria in your tank. They are holding tanks. The waste should not be in them long enough to breakdown. The are not septic type tanks. Basically the holding tank chemicals are perfumes to mask the odor. Many use to kill the digestive actives of a live septic system and were outlawed. They have come up with some new septic friendly odor disguising alternatives. Some use them some don't. There is no wrong or right way. Try different brands till you find what fits your needs.