De-ionized, it is essential that water used in cosmetic preparations is sterile to avoid contamination of the product.
a vague and misused term, subject to misinterpretation. Usually implies that levels of contaminants (salts, metals, etc.) have been reduced but not completely eliminated. The NSF website defines it as "A type of water which has been produced by distillation, deionization, reverse osmosis, or other suitable processes. Purified water may also be referred to as 'demineralized water.' It meets the definition of 'purified water' in the United State Pharmacopoeia."
Water that has been treated as such to filter out sediments, remove all dissolved minerals and kill all micro-organisms.
Processed through deionization, distillation or other suitable methods to produce a water that is essentially free of dissolved minerals and meets U.S.P. standards for purified water.
Water that has been filtered and purified to remove contaminants.
Water produced from water meeting the USEPA standards for safe drinking water through treatment by distillation, reverse osmosis, deionization, or other processes and which meets United States Pharmacopoeia (USP) purity standards for "purified water" can be labeled as "purified."
Purified water can come from any source, including spring water, well water, seawater, or municipal water. This source water is then processed by reverse osmosis or deionization to produce a water that is indistinguishable from distilled water from any other source. Purified water contains no dissolved solids.