High-Level Disinfectant 1 Gallon. Glutaraldehyde-free, ortho-phthaladehyde solution. 10-minute high-level disinfection time that's faster than all other OPA disinfectants in the market today. Has up to twice the reuse life of existing OPA's - lasts 28 days. OPA/28 also effectively inactivates: TB, HIV2, MRSA, VRE, Hepatitis Viruses. One gallon bottle