Ensuring effective disinfection in healthcare is subject to some unique challenges. In particular, hospital rooms are full of surfaces of varying shapes and sizes, and knowing where a disinfectant has been applied can often be challenging. To help, users need an indicator to know that they have correctly applied a disinfectant to a surface and that they can be assured that the disinfectant has worked as intended.
The most common industry practice is to ensure that the surface is kept visibly wet for the full contact time indicated on the product label. The contact time, also known as the wet time, is the time that the disinfectant needs to stay wet on a surface in order to ensure efficacy. It is determined by the manufacturer and based on the results of microbiological testing using EPA-approved methods. Contact times for disinfectants range from 15 seconds to ten minutes, the maximum time allowed by the EPA. Disinfecting products usually include directions that instruct users to ensure that the surface is visibly wet for the contact time.
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