Designed specifically for RV holding tanks, these strong formulas ensure powerful year-round odor control. Available in convenient easy-to-use forms, these products give you maximum performance with minimum effort. EcoLogo is North America’s oldest, most-recognized and respected environmental standard and certification organization. It is the only standard accredited by the Global Eco-Labeling Network that meets the international standard for environmental labels. To meet stringent EcoLogo criteria, a holding tank additive must Control odors and help decrease waste materials, Be biologically-based and non-toxic, Not harm humans or riparian and aquatic species, Not accumulate in the environment, Have limited surfactants that biodegrade.