Milli-Q

Milli-Q is a trademark created by Millipore Corporation to describe 'ultrapure' water of "Type 1", as defined by various authorities (e.g. ISO 3696), as well as their devices for producing such water. The purification processes involve successive steps of filtration and deionization to achieve a purity expediently characterised in terms of resistivity (typically 18.2 MΩ·cm at 25 °C). The term is also commonly used as a genericised trademark to refer to other purified waters and purification equipment.