Hi,
I dont know what quality water is at your pharmacy. I do know that many
dentists here use deionised water because its cheaper. 
regards,
Robert Beasley

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| A thought.  You can get water that is good for intravenous use from an
| pharmacy.  It is distilled and claims complete purity.  Could this be a
| candidate for investigating a pure distilled water?
| 
| Jack
|