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Pure water is water intended for human consumption and may be sealed in bottles and other containers without any additives. It is used as a recipient for non-parenteral preparations and for other purposes, such as cleaning certain equipment and non-parenteral products. Purified water is prepared from suitable drinking water by distillation, ion exchange or any other suitable means.
Purified water is water that has been mechanically filtered or processed to remove impurities and make it usable. Distilled water was, in the past, the most common form of purified water, but, in recent years, water is more frequently purified by other processes, including capacitive deionization, reverse osmosis, carbon filtering, microfiltration, ultrafiltration, ultraviolet oxidation, or electrodeionization. Combinations of a number of these processes have been used to produce ultrapure water of such high purity that its trace contaminants are measured in parts per billion (ppb) or parts per trillion (ppt).
Purified water has many uses, primarily in pharmaceutical production, science and engineering laboratories, and industry, and is produced in a range of purities. It is also used in the commercial beverage industry as a primary ingredient in trademarked bottling formulas provided to maintain product consistency. It can be produced on site for immediate use or purchased in containers. Clean water in colloquial English can also refer to water that has been treated to neutralize (“potable”) but not necessarily remove contaminants considered harmful to humans or animals.
