Hi all.  Just to let you know that I got my TDS meter today and the reading for 
the distilled water was 000 and even though this may not be 100% accurate (but 
near enough) I guess this means the water is pretty pure.  My sort of yellowish 
batch of CS hovered between 4 and 5 then settled on 4 which I take it means it 
is about nine ppm approximately.  Dee