[Nickbrick]

How long will di ionised water keep in a 25 ltr drum for thanks

[tonycarr]

i looked this up on a Physics forum 

tony

Deionized water, also known as demineralized water[2] (DI water, DIW or de-ionized water), is water that has had its mineral ions removed, such as cations from sodium, calcium, iron, copper and anions such as chloride and bromide. Deionization is a physical process which uses specially-manufactured ion exchange resins which bind to and filter out the mineral salts from water. Because the majority of water impurities are dissolved salts, deionization produces a high purity water that is generally similar to distilled water, and this process is quick and without scale buildup. However, deionization does not significantly remove uncharged organic molecules, viruses or bacteria, except by incidental trapping in the resin. Specially made strong base anion resins can remove Gram-negative bacteria. Deionization can be done continuously and inexpensively using electrodeionization. Deionization does not remove the hydroxide or hydronium ions from water. These are the products of the self-ionization of water to equilibrium and therefore are impossible to remove.

 http://en.m.wikipedia.org/wiki/Purified_water

So as long as you keep the water sealed and all that, your water is kept clean. No "order of time" or whatever.

Reference https://www.physicsforums.com/threads/de-ionized-di-water.495286/

[Clever Forum Name]

Usually until the end of the year.

[paulben]

What next week

[Nathanael Jones]

It lasts twice as long if you freeze it.   

[SeanK]

As long as the container is sealed then forever just don't try and drink it, if you have any doubts just
check the tds before using.