You can easily maintain a safe, fun pool at 80ppm (of CYA). Just follow Ben's Best Guess table for the correct amount of Free Chlorine.
Refilling evaporation won't help you, but refilling after backwashing, rain water, etc, will. You have to dilute the CYA. If you want a CYA of 40, right away, you'll have to drain half your water and refill. You can run at high CYA for this season, drain it down in the fall and refill next spring.
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