When asking a question like that you need to remind people where you are, and things like if your pool gets full sun all day, is it covered during the day, do you have a clear or opaque cover, and anything else pertinent.
Most people find losing about 2ppm per day normal but your CYA may have to be more or less than 40 to acheive that. I get full sun all day and lose about 2ppm per day in sunny South Alabama but I run my CYA near 60.
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