CAl and alk levels

[Bryan]

I do...have you checked for a faulty test kit. What test kit are you using..A lot of problems with Salifert as of late, could be your alk or Ca test kit.

Originally Posted by untamed

There is no mechanics that I can think of that would allow Ca/Alk to go UP beyond the levels of the replacement SW in any system that is supporting SPS and coraline algae.

[mseepman]

I thought the same thing...but I have a Hagan test kit and the Salifert and both read similar. I bought the Salifert kit after getting these readings from the Hagen kit. I have a friend with a red sea kit (ugly I know) but I will have him do a test and see if he confirms.

[Captainhemo]

Test the RO water you are buying for Ca, not being run through a DI filter I'd bet it contains Ca.
As mentioned by Scumchug, you are then adding Ca everytime you top up your tank and slowly increasing Ca levels.

[mseepman]

I will try testing it, but wouldn't it show when I test my newly mixed salt water too?