Yes a true PH of 2.2 should burn you.
remember we are NOT talking about PH
rather the alkalinity
alkalinity> ability of PH to neutralize acids
I tested my parents house (3.5 hours north) well water and the alkalinity was off the charts 16+
so I know this pond has low alkalinity, however the water is not deadly LOL there are living organisms in there doing fine
5+ tons, is what I'm thinking
maybe 10 no kidding