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pH test

I notice that wagner sells pH test with distilled water. I thought it was important to use deionized water? As distilled can still carry a charge that can throw off a pH test.

From ASTM F710:
5.3.1 To test for pH at the surface of a concrete slab, use wide range pH paper, its associated pH chart, and distilled or deionized water. Place several drops of water on a clean surface of concrete, forming a puddle approximately 1 in. (25 mm) in diameter.

From Wagner:
Both de-ionization and distillation processes remove ions from the water and produce "pure water". De-ionization processes can leave bacteria in water. Distillation leaves pure water. In terms of quality, distilled water is better. The standard calls for using either.

Hope this helps you, eaadams.

thank you!

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