So, we had our pebble tec done at the end of May. Since then, it's been fantastic. We had a great summer and probably swam more this summer than the last two years combined.
Within the last month or so, though, I've noticed some discoloration in one part of the pool near the shallow end. Here are some pictures, but I'm not sure how helpful they'll be: Discoloration pics
Any thoughts? I've struggled some with keeping the pH down, but I'm getting it down to 7.6ish every weekend. I was using dry acid at first, but am now using muriatic (diluting in a bucket, adding to deep end with the pump going, then brushing the sides afterwards).
TA is ~60-70, calcium hardness is... I don't actually recall, but it was in the range specified by pool calculator a month or so ago.