Dear Ole Bob,
We have not been able to source a meter yet (in 
England), and if we have to send to US it will be 
some time getting here. So, is there any other 
way that I can tell the ppm. This is going to be 
crucial in preserving I think.

Given that I have 5ppm, how then can I make it 
9ppm, as more time only means larger particles.
Kind Regards
Carol


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