I would definitely replace your API kit. I don't have experience with the salifert tests but like said before, a lot of people really like them. I personally use Red Sea tests and really like how easy they are to use.
I do have the Hanna Checkers (Alk,Calcium, Phosphate) as well but still will go to the Red Sea to double check.
I do have the Hanna Checkers (Alk,Calcium, Phosphate) as well but still will go to the Red Sea to double check.