Apex Trident help

[theturk]

I purchased a trident from a friend -- set it up and working great. My reagents got low so I purchase new bottles. Swapped them out, and did a calibration using the paraments in the sample bottle.

Prior to the change, my ALK was around 8.1, CA around 450, and MG around 1500. After I made the switch, my tests are coming back ALK around 8.1, CA around 320 and MG around 1500. I used my Hanna CA checker and got CA around 450. I tried calibrating it again. Same result.

What should I believe. Hanna is consistent with pre-reagents swap but Trident is not.

 

[T-J]

Get a third test somewhere as the tiebreaker.
You could also swap out the CA reagent to see if it was a bad bottle.