The process of removing nearly all dissolved salt and mineral ions from water can prove ideal for facilities requiring pure water for a variety of applications. Below is a breakdown of various organizations that provide us the specifications and parameter analysis for the demineralized water.

The organizations covered in this article are: WHO, USP and BIS. The organization may vary according to the region where demineralization plant is set up.

1. DM (DEMINERALISED) WATER SPECIFICATIONS AS PER WHO

Table showing analysis of demineralized water

2. DM WATER SPECIFICATIONS AS PER USP

Pure water can be prepared by any one of the methods as per pharmaceutical grades of water but the only condition is that it must satisfy USP standards. The pure water thus obtained is used in producing USP products.

Limits commonly used

Table: DM specifications as per USP

3. DM WATER SPECIFICATIONS AS PER BIS (BUREAU OF INDIAN STANDARDS)

Depending upon the extent of purity of water there are three grades of reagent grade water:

Grade 1:  In test methods such as trace analysis which require great accuracy and maximum precision. By distillation of feed water, reagent water can be made.

Grade 2:It is used where the major concern is that organic impurities should not be present for example in laboratories.  It is not used for analysis in medicine and biology.

Grade 3: In washing of glassware, where more quantity of water is needed but of less purity.

Table: Requirement for Demineralized water as per BIS

These are the specifications from various organizations around the world and these serve as a basis to all industries which requires demineralization for its water demand.