It took almost two years for the nodules to start forming, but if they have nothing to do with pool chemistry, then it's highly possible the PB didn't do a proper plaster job. Is it safe to say that if chemistry was not the issue then the nodules will likely start popping up again?Shrinkage cracks can be caused by excess water and excess calcium chloride added to the plaster mix. They can also be caused by not protecting (tenting) the plaster finish in hot and dry weather before it fills with water. Delamination (bond failure) can also cause cracks and pinholes to form, and then nodules will generally appear soon. The formation of nodules have nothing to do with the balance of the pool water.
Well, since I wrote that in August, my CH is up to 400 with the Luna Quartz plaster. So I wonder what's going on. My fill water CH is only 50, so that's not the source. I have not added any chemicals with calcium in them.I also have Luna Quartz. I also have high CH at 370. But it’s stable so I don’t care.
I would leave it alone and see whether it stabilizes. If it does, relax. If it continues to rise forever, you have cause for concern.
I wish I could say that there is a happy ending to report, but unfortunately, I'm still dealing with rising CH and pH. I haven't checked CH in a couple weeks, but when I last checked, it was at a 410. This is up from 310 in mid-August, and I also have not added any chemicals that have calcium (switched to using liquid chlorine). Given that our tap water is only 160 CH, I can't imagine this would cause my pool CH to rise by 100 ppm within two months. Surely we've had some evaporation, but not enough to cause that kind of a jump in such a short time.Well, since I wrote that in August, my CH is up to 400 with the Luna Quartz plaster. So I wonder what's going on. My fill water CH is only 50, so that's not the source. I have not added any chemicals with calcium in them.
@aaronk , did you ever resolve your CH issue? How does the story end?