McKesson Chemical Scent OPA High-Level Disinfectant Liquid contains buffering agents for corrosion inhibitors. It contraindicated for urological instrumentation to be utilized for cystoscopy or other urological procedures for patients with a history of bladder cancer. it is ready-to-use, no mixing or activating. It has long life, activated 28-day, 0.575% buffered ortho-Phthalaldehyde solution which contains surfactants. It has 10 minute manual disinfection time at room temp of 68°F (20°C). It has 5 minute AER disinfection time at 77°F (25°C).