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Star Brite's Odor Away uses a nitrate formula instead of formaldehyde to go after holding-tank odor at the source, encouraging natural breakdown of waste rather than just masking the smell. It's unscented, so it won't fight with anything else you're using in the bathroom.
Because it's biodegradable and free of added fragrance, it's a good fit for RVers who want effective odor control without harsh chemicals going into dump stations and septic systems.
Keep a bottle in your tank-care kit and add it after each dump for a fresher-smelling black tank on the road.