My pool has developed a rough, sandpaper-like texture on the plaster surfaces that used to be smooth. Correct me if I'm wrong, but I assume this is scaling. I also have white staining on the tile at the waterline.
It's a non-saltwater plaster pool using Chlorine. The pool is a couple of years old and the pH tends to creep upward if I don't stay on top of it. I assume that it got high and stayed high over the winter while the pool was closed.
My CH seems rather high, probably because I've been using cal-hypo.
My current levels are:
Temp: high 80's to low 90's. Currently 92.
FC: 7-10 (try to keep it around 10.)
pH: 7.6 (I try to keep it right at 7.6 with daily testing, and have been for the past 2 months since we opened)
If my calculations are correct, this gives me an LSI of 0.41, which can cause scale.
So, two questions:
1. What's the best way of going about changing the levels above to get the LSI to a balanced level that won't cause scale?
2. What's the best way to remove the scale that has already formed on the plaster?