I have never seen double or triple distilled water on the shelves here. Do you have to get it at a health food store? I haven't found the distilled water to be lower than around 3. give or take a bit.
When I started using my SP I marked my distilled bottle with the initial reading I got after first opening it. Still, I check each time before using just to make sure and the second readings I got were much higher. But then, I have often felt that the area I live in was a bit, em, toxic. Who knows what's floating around.
Thanks for the info, newport. I'm going to find some double or triple distilled water somewhere.