Thanks mr b. I was looking and recording the wrong side of comparator. One thing though my FC is 3, my pH is 7.8, but my TA seems to be reading to high, yesterday 110 today 100. I set my target for TA for 75 enact calculator. The calculator does not tell me to do anything about the high TA reading. Is this because I have not entered a way that I would be dealing with this event, i.e. Muratic acid, borax?