Nature's Genius Odor and Tank Treatment: Natural Microbes for Marine and RV Holding Tanks, Fresh-N-Clean Scent, 32-Ounces Live bacteria in the highest concentration available, ready to go to work  not dormant spores Enhances long-lasting cleaning effects by degrading residual organics long after cleaning is complete Aids in treatment system function by improving beneficial microbial counts Free of caustics, it will not damage pipes or plumbing fixtures Beneficial microorganisms for specialized odor and Hydrogen Sulfide (H2S) reduction, digestion of sewage, oils, grease, starches, protein, cellulose