Quote:
Originally Posted by braappn
I notice some inconsistency with my alk test. The first test often reads a higher alk than subsequent tests. This test procedure is very simple so there must be an explanation. I wonder if something in the tiny amount of residual water in the vial is affecting the test results. I do rinse the vial very well with rodi after each test but then put the vial away wet.
The way you describe your mg results, well it makes sense that you change the test procedure and it produces different results. But the alk test is so straightforward that the inconsistency is strange to me as well.
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I’ve extended the 15 sec mix on MG1 to 30 sec mix and interestingly I’m getting lower results that now make sense. On the face of it, it looks like the mixing isn’t long enough to dissolve and mix the ingredients. The Red Sea is now lower than Salifert by 30 points.
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