Well I e-mailed 'Lickwid' and they sent me this back. Not really sure what to make of it.
Hi James,
Thanks for your email. I can assure you that our deionised water meets
USP, EP & BP specifications.
Deionised water is an interesting thing actually. It's always unsafe
for human consumption in the traditional sense; i.e. drinking, whether
it's medical grade or not. When deionised the water is stripped of all
minerals, and therefore by reverse osmosis (a chemical/biological
process) it will try to resolve this unnatural imbalance by absorbing
those minerals back from from its surroundings. When ingested it will
deprive the human body of minerals (specifically calcium) in an
attempt order to return to its original state. Because the chemical
composition of drinking water has not been altered, no such process
takes place within the body.
Basically, if you drink de-ionised water for a long period of time you
will end up with various mineral deficiencies. The amount of
de-ionised water in our e-liquid is <10%, and if it were not
deionised, some minerals contained within it would carbonise on the
coil of your e-cig and shorten your wick's life. I won't claim that
these levels of deionised water are necessarily safe so we will leave
it up to you to decide as a consumer. All I'll say is that I vape
Lickwid e-liquids almost exclusively and am not worried about this at
all
I hope this helps, and apologies if you found some of that information
unnecessary. I've become quite interested in chemistry and find these
things interesting!
Many Thanks,
Alex
www.lickwid.co.uk