In the US you can get it at a "water softening" company like Culligan. They
use it to clean "green sand" water conditioners. Maybe check with a similar
company in the UK?


"Marcus Fox" wrote in
message ...
Where can I buy this as crystals or solution in the UK? I doubt it's
readily
available as crystals as they can be mixed with sugar to make an
improvised
explosive. Mind you, I guess they can be re-crystallised from solution
too.

Marcus