I recently had a major rip in my liner and thus had to replace it. I was surprised to find out that when the pool was drained, my liner was totally white when it was dry. When it was wet, it was blue. I could rub and have a white chalky substance on my fingers, so I know it was calcium. This was surprising because my calcium hardness reading has always been very low - like around 100. At any rate, since I was replacing the liner, I didn't try and remove the calcium, so I can't help you there.
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