Getting good info from the commercial bottlersof demineralised water is
like pulling teeth. I have been buying a brand that consistently
measures 0 on a TDS and about 0.4 on a PWT. It's from the 'ironing
aids' dept, not the drinking water section. I rang and asked them why
they put 'DO NOT DRINK' and 'NOT TO BE USED IN THERAPEUTIC DEVICES' on
the label. As I expected, they said it was just a legal thing. They
didnt HAVE to have it on the labels but they dont produce the water in
a 'food grade' factory so they just wanted to cover their backsides.
Obviously they knew people were buying it and drinking it for CS. And
they heard someone entered it into a drinking water taste competition
and it won 3rd prize. I always thought water that pure must be reverse
osmosis, but the salesman said it wasnt RO, it was 'de-ionised and
polished'. (Even though its labelled as 'demineralised'). He said they
use a second hand purification set-up they bought from the lab of the
local university. (Must have been a damn big uni because they now ship
it all over Australia.) I'm not convinced an RO unit isnt involved
somewhere. I suspect they may run the water through a RO pre-filter
before it goes into the 'polisher', but I could certainly be wrong.
Maybe some-one on the list knows about these things and can clarify the
difference between de-ionised and demineralised if there is such a
thing. All I know is it makes perfectly good CS. Its almost too pure.
David
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