Thanks for weighing in. Very helpful. Since you change individual reagents as needed, do you then calibrate every time a bottle is changed?
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I recalibrate when I replace B and C. You will replace A 2x for every B and C and Alk doesn’t seem to drift too much anyway.
@JVU I’ve tried to trade my spare A reagent for BC and no takers. It makes sense I would have lots of spare A since I run Alk around 8 and Ca/Mg as high as possible. Someone should share a recipe to test Alk using the A component so can be used as a manual test reagent at least.