Eco Strong Marine Tank Treatment works by emulsifying sewage, paper waste, existing sewage, and residual sludge from years of build-up in black/gray water holding tanks in all sizes of boats. Our one of a kind targeted solution does not mask odors it terminates organic waste agents at the source allowing for complete removal of foul smelling sewer smells in your boat and at the pump out station. Every single ounce of EcoStrong Marine Tank Treatment is all natural and chemical free – safe for boats, people, and the planet. Not only does EcoStrong’s professional grade formula work in your tank, but it also works in drains, toilets, and bilges making it a true all purpose boating must have.