Starbrite Instant Fresh Toilet Treatment is a simple one-step, highly effective way to deal with the boat's holding tank that eliminates the need for multiple chemicals. This efficient, biodegradable formula quickly breaks down waste to remove potential odors, while leaving a light, pleasant scent behind. Additionally, special lubricants prevent drain valves from sticking. Also works in portable marine toilets. - Non-formaldehyde, non-staining, biodegradable formula. - Latest technological lubricants keep drain valves from sticking. - Breaks down waste quickly and efficiently. - One ounce treats five gallons. - Fresh pine scent controls holding tank odors Fresh lemon scent controls holding tank odors - Complies with EU