We tested it out tonight. As expected, distilled water read 0 ppm. Our local tap water read 146 ppm. The 40% food grade peroxide (Solvay brand) was 18 ppm. The 45% technical grade peroxide (FMC brand) read 232 ppm.
Uggh... the 50% tech grade we bought from Solvay reads 40 ppm.
-p
Mars or Bust! www.marssociety.com
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