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I use the red sea test kits for alk/CA/Mag and Salifert for nitrate/P04. They have been working for me, easy to use/read and I'm used to how to use them.
That said, I have hanna checkers sitting downstairs that I've never used...
Not sure which test to trust on Ca............API reads 380 and Red Sea Reads 500! Could be in my procedures with the Red Sea but I am following the directions as listed? Suggestions welcome.

