Initially, I think not. The day this measurement was taken I also had a pH of 8.2, and TA of 136. If it were to be trusted, the Saturation Index was measured at 1.1. I have a plaster-bottom pool of about 15k gallons.
I had not added the weekly dose of acid, so the pH was squared-away right away, but the chemical-seller saw an opportunity to sell something called "Suspend M+S", a stain and scale control. But I have got a patch of discoloration that doesn't brush off, so I'm thinking of trying this stuff. The cost is about $12 a quart and they recommend 1.5 quarts.
Does this make sense?