CYA gone but FC has been normal all winter.

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I would suspect you will use less chlorine at 60 ppm. But I also suspect if you test CYA every month from May to September your level will decrease over that time. So starting at 60 will have you down to 40 or less by the end of summer.
 
My guess is that your using tri chlor hockey pucks in your pool or some other form of chlorine that contains stabilizer in it (CYA)

You probably just got lucky and kept getting fairly consistent results. A hot, sunny environment will consume CYA. My environment isn't even all that hot or sunny for most of the summer but my pool still consumes CYA at a slowish but consistent rate. You shouldn't expect that CYA will always remain constant for the most part, you will lose some over time.
 
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