Calcium and Alk test kit questions

[DanG]

I agree with Johnny Reefer, my hagen test kit works fine for alk. For calcium, I've used both the hagen and the salifert. The results were within 10ppm of each other, but the ease of the salifert kit over the hagen kit is worth it in the cost difference. The hagen kit was about 15 bucks, the salifert was about 30. The salifert kit is good for 50 tests.