Greenmaster,
If you read up on limewater, it adds both the carbonate and calcium ions in the same ratio that they are used up. It is actually one of the most balanced methods I have found. While it will increase the pH in my tank, being in an enclosed house the tank pH has always been on the low side. I have every intention of getting my test kits first. I have a lot of time and effort into this thing and there is no way I'm going to risk it over not having a $30 test kit.
I finally got my hands on an IR thermometer and measured the temperature of the tank. After a bunch of readings all over the tank and sump, I figure the controller was at least 2 degrees low :mad2:. SO, I adjusted the calibration on the controller to be about 1 degree below what the glass thermometer was reading. Very annoying as the controller has turned the heaters on several times over the summer and they didn't need to be on.
Live and learn.
RocketEngineer