Metrex Metricide 28 Disinfecting Solution, 1 Gallon. A long-life, buffered glutaraldehyde that can be used and reused as a sterilant and high-level disinfectant for up to 28 days. Recommended for immersible medical and dental instruments. Contains a surfactant to enhance the disinfection process and contains a rust-inhibitor to reduce corrosion. No dilution is required.