quantum water disinfection is a technology that is used for the filtration of water. Getting clean water is the biggest challenge people face nowadays. As the world develops, pollution is increasing and water is getting dirtier.To overcome the problem of dirty water at a minimal cost, quantum disinfection is used. Firstly, the filtration was done by using different chemicals, such as chlorine. This method of filtration has side effects that impact humans? health. So a new idea was introduced, which was quantum water disinfection. As opposed to applying substances with names like chlorine, quantum dots are used as a substitute. Reactive oxygen species are produced when light meets these dots. These substances operate as microscopic cleaners, keeping water safe to drink.