Odorlos Holding Tank Treatment is an industrial-strength, environmental award winner that effectively eliminates all holding tank odors without masking perfumes or staining dyes, using only 4 ounces per 40-gallon tank. Odorlos breaks down waste and tissue, lubricates valves, and speeds up the natural composting process by preventing hydrogen sulfide gases. Safe for chemically sensitive people, any septic tank system, plastic or porcelain toilets, and all holding tank systems. Formaldehyde-free. Made in the USA. Specifications:• Quantity: Ten 4-oz. packs• Total Weight: 2.8 lbs.• Manufacturer: Valterra Products, LLC• Model#: V77011 Uses only 4 oz. per 40-gallon tank Breaks down waste/tissue; lubricates valves Speeds up the natural composting process | Valterra Odorlos Dry 10 pack, 4 oz ea. Made in USA