I've attached some photos of spots that I'm getting in my pool. There was 1 set of these when I first bought the house a year ago. I do know the original owner had used a pool service and not chlorine pucks. After I moved in, not knowing anything I listened to my brother and just did the pucks and MA. I've since completely switched over to TFPC after a drain and re-fill a month ago, my pool looks and feels amazing, but now I've gotten more and more spots. I read somewhere in the forums recently about using vitamin c pills or pucks against the spots to properly identify, but I just wanted to be sure. I've attached pictures of my plaster below (yes the plaster is really old and I'll eventually get it re-done).
My current pool chemistry readings are:
TA: 110 (a tad high, but have lowered from 130)
Picture 1 is of where the first set of spots were when I moved in, the others have shown within the last 2 months. The second photo is by the jet return where I usually poor the liquid chlorine or MA. I do brush after I pour in MA.
As always, thanks you for your time!