[Davew]

De-ionised water for sale for about five pounds for a five litre container.......and there's me chucking mine all over the windows!

[Ian Rochester]

My wife is the accountant for a company and one of their product is WFI (Water for injection).

I was chatting about it to the MD at last years Christmas party and it is basically a super pure water that goes through a 15 stage filtration process and is used in the medical industry as a carrier for injecting into patients.  He wouldn't tell me how much they sold it for but I'm sure it wasn't cheap!