And just to throw another variable into the mix, I think it could be safely stated that all vinyl liners are not the same. Or at least the way they're colored.
I'm another who's shocked many times over the past three years I've owned my pool. The liner's 8 years old (I have the receipt) and the colors are still quite vibrant. Like Richard, I add 12% at the return in the deep end and always allow it to circulate at least an hour after. I'm thinking there are dyes used to color the vinyl that may be more susceptible to chlorine than others, not unlike clothing in the wash.
C.

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