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West Marine ExterminOdor Head & Holding Tank Treatment is an environmentally safe formula controls odour and helps sanitation systems to function smoothly.  It is an easy way to control holding tank odours and gassing, this chemical-based, head and holding tank treatment works without formaldehyde to control odour.  Special additives keep holding tank walls and drain lines free from debris.  Latest technology lubricants keep drain valves from sticking.  Environmentally safe formula allows pump out at any dumping station.  Safe and effective for all RV and marine toilets.  Has a fresh mint scent.

Dosage: 120 mL (4 oz) treat 75 L (20 gallon)