I never thought to do this David-- I will in future.  Normally, I tip off the 
first bit that comes out and I always boil my water before it goes in the 
distiller.  dee

On 5 May 2010, at 10:32, Alchemysa wrote:

> It's been mentioned here before that one should not use the last cup of water 
> that comes out of a steam distiller (for making CS).
> 
> Out of interest I measured the ppm of an early cup of water from my gallon 
> distiller and compared it with the last cupfull.   Initial tap water reading 
> was 325 ppm.
> 
> Early cup: 3.4uS  (1 ppm)
> Last cup: 7.6 uS (3 ppm)
> The initial ppm was 325 ppm.
> 
> Clearly theres a major deterioration in water quality when you start to boil 
> off those last dregs in the distiller.
> 
> David
> 
> 
> 
> 


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