That's why I went back to the company and double checked their figures which they reconfirmed to me in writing today.

I was in the kitchen with the scales last night to measure 6g and it is definitely just a teaspoon! As per my calculations this means that their food contains 0.0006% added salt which equates to 0.00024% sodium, not allowing for any naturally occurring sodium of course. As they say themselves, this is a tiny amount and one wonders why they actually bother to add any at all at this kind of level.