Alk was pretty low. I'm somehow remembering it at 3dkh but it was 6am and I'm not sure that it was quite that low. I added a little b-Ionic Alk to it this morning. I'll take another measure tonight. I'll have to take the pH with a test kit to double check my pH meter. Seems to me that the pH would be lower than 8 if the alk was that low but the pH in my main seemed within reason last time I checked it with the pH meter (around 8.3).