Thanks to the forum my chemistry is finally bangin'
Based on the pool calculator, the csi -0.79 "Corrosion of plaster likely". Not until it gets to more than -0.30 does it say "balanced". This is not what I have heard through searching posts.
For me, since I use softened water, the easiest thing would be to add CaCl to get the csi 'less negative' rather than mucjing with my beautiful TA I worked so hard getting down to range or pH. Still I want to be careful since getting calcium back out is no fun.
The only thing I have left to do is dump in 30-50 ppm of borates but that doesn't seem to have much of an impact on the csi.
Any practical advice for me with respect to a good target range for my plaster surface? thank you in advance