(01-04-2013, 10:20 AM)hunningsedaniel Wrote:(01-04-2013, 09:34 AM)Allen Wrote: Both local supermarkets I go to only have deionised water, neither of them sell distilled water
Even though your tank says distilled water, there is no reason that you cannot use deionised water. it is more pure than distilled water and you will get the same humid effect from it. It might even lengthen the time between tank cleanings.
No. "Deionized" water isn't necessarily cleaner than distilled water. It might not even be safe to drink.
Deionized water has had ionic contaminants like minerals removed, but the non-ionic contaminants aren't necessarily removed. Think of it as having the minerals and salt removed, but not the other stuff. In particular, organic contaminants that might provide food for germs may not be removed. For that matter, it may not be processed to remove or kill bacteria, viruses, and other germs.
There is also some deionized water that is not intended for human consumption. Sometimes, water is deionized by chemical treatment, and there might be some residue left behind.
Just because it's good for steam irons or car batteries doesn't mean it's safe to drink or inhale.
Of course, you could make good drinking water with deionization as part of the process. If it's sold in grocery stores as drinking water, it's probably OK, but not necessarily as good as distilled.