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From what I read, 2.9 is the low end of the range which is -2.9 to -4. So, -2.9 is still within the normal range, but on the edge.
Regardless, it's still pretty acidic. A common vinegar is in the order of -2. Drop a seashell in some, and it will be gone in a day or so depending on how thick the thing is. Acid rain is in the order of -4.2 and 4.4, but that's an average.
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Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
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