Regarding the Ca test, you add a drop at a time, until the color changes
(shaking after each drop). If the color starts to turn from dark blue to
purple-pinkish after 20 seconds, add one more drop, and then take that
reading
off the syringe.

Marc


Thanks Marc, I understand that part but what I was wondering is if there was
a brand of test kit for Phosphates that uses the same method as Salifert's
Calcium test kit.

Any ideas?

TAIA

~Mort