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I started dosing kalk, from 8pm to 7am, to help with pH. pH has been running from a low of 7.7 at night, to a high of 7.9 during the day, on average. My goal was for kalk to eliminate the low dip at night. Instead, it looks like it did the opposite and eliminated the high peak in the day. Probe is new and was calibrated. House is new and CO2 is high. I'm in Florida so the house is closed most of the year. In the winter when I can open the house up, pH is much higher. Here is a chart for the last several days. The left area with the peaks and valleys was without kalk. The area to the right is with it. I perplexed with what's going on.