Star brite Instant Fresh Toilet Treatment controls holding tank odors and gassing. It also keeps holding tank walls and drain lines free from debris while lubricants prevent drain valves from sticking. Ideal for all RV, marine, and portable toilets. The formaldehyde-free formula can be pumped out at any dumping station. Eliminates and prevents holding tank odors Lubricates drain valves Breaks down waste and tissue Formaldehyde-free Fresh pine scent 8 oz. treats up to 40 gallons.