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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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Selected Answers

From SAUL DIAZ VERA of CPPQ S.A. on November 1, 2015:
The water should be clean and free of contaminants. Fresh pure water must be less than 1000 microsiemens, with low chloride and sulfate ions. The pH must be close to 7.

From Lydia Frenzel of Advisory Council on October 29, 2015:
I just posted on 2015-10-29 a collection of tables concerning the quality of water for use in high pressure pumps on, and It includes surfblasting as well as tables suggested by the pump manufacturers themselves. Use filtered potable water as a general rule. The pump manufacturers are concerned with the maximum service life for the pump and the tips. Andreas Momber discusses water quality for surface preparation in his book, "Hydroblasting and Coating of Steel Structures," p. 48. “For running high-pressure plunger pumps reliably and for achieving a maximum service life, pump manufacturers recommend drinking water quality….. But if suitable filter and cleaning arrangements are applied, even river water or seawater can be used. Recommended filter size depends on the sealing system as well as on the operating pressure.”

From trevor neale of TF Warren Group on October 28, 2015:
Can distilled water be classed as fresh !!

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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