Richard, Thanks for your response. I have seen just about every pool store that has tested my sample pull this stunt. I think this is one of their "Sell the Acid" tricks.

As a side note, I think I have an issue with my SWCG as when the unit switched back to Polarity 1, the low salt light came back on. I am trying to get a warranty claim going as it is only 8 months old.