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You might try adding a fan to your sump to increase evaporation. More evaporation more kalkwasser that can be added with your ATO. More kalkwasser means more ca/alk added. Make sure your top off water is at full saturation too. Should get a pH reading around 12. Most tanks can maintain with kalkwasser alone this way. If not it might keep the changes small enough during your 24 hours at work period to not be harmful