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August 27 - September 2, 2012

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

Selected Answers

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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