Phthalaldehyde application solution is widely used as a high-level disinfectant in healthcare and laboratory settings. It is effective against a broad spectrum of microorganisms, including bacteria, viruses, fungi, and mycobacteria. Commonly utilized for disinfecting heat-sensitive medical instruments such as endoscopes, it offers a faster action and better material compatibility compared to glutaraldehyde. The solution is often employed in automated endoscope reprocessors due to its stability and reduced odor. It does not require activation before use and maintains efficacy in the presence of organic matter, making it suitable for clinical environments. Additionally, phthalaldehyde is used in some industrial applications for microbial control in aqueous systems.