You should be able to run the cl level up to 15ppm (on a short term basis, such as your baquacil conversion) with no long-lasting problems. I would not recommend doing it on a long term basis, but for the several days of a baquacil conversion, many (if not most) of us have had our cl levels in the 10-15ppm range.
My liner was virtually new when I did my conversion (shortly after I installed my pool). This is my 3rd summer with chlorine, and the liner is still a nice, dark blue. I normally keep my FC level at the 3-5ppm range.
The only place that is faded is where I dumped in too much cal hypo when I was doing the conversion, and it sat on the pool bottom for about a day. Oops! No harm done, but it's bleached in that area.
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