Demineralized water is water that has been processed in such a way as to become free of dissolved minerals. It is produced through distillation, deionization, reverse osmosis or nanofiltration, or electrodialysis.
Demineralized water is highly agressive and is therefore not fit for human consumption. Due to the lack of minerals, demineralized water has little ability to quench thirst and often has poor taste. A number of studies has concluded that demineralized water can have adverse effects on human health because of the lack of certain constituents. Furthermore, since drinking water is generally distributed through storage tanks and pipes, demineralized water would inevitably leech metals from the distribution channels.