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October 24 - November 1, 2015

How pure must fresh water be for water washing or waterjetting, and how do you determine the water’s purity?

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From Mark Schilling on August 30, 2012:
     It's a goofy question subject to all sorts of misinterpretations and exaggerations. What exactly is "fresh" water? What does "purity" really mean? Some people will no doubt over-emphasize chloride ion, supposedly the most nefarious and dangerous thing in the coatings cosmos. National drinking water regulations currently set the limit for chloride ion at 250 mg/L with a total TDS limit of 500 mg/L. I sold a house that was on a water well. I had to have the well tested before I could sell the home. The pH was 8.6. Current regulations set the limits at pH 6.5 to 8.5. OOPS! Water quality is an extremely complicated issue. Only a salesman would want to distill this issue down and tell us how "pure" we need our wash water to be.

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