Where can I order predetermined solutions for my parameters so I can test the accuracy of my test kits? I'd like to test Alkalinity, phosphate, nitrate and nitrate. Maybe calcium too.
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I currently have a blend of Hannah, red sea, and salifert. I have both Hannah and red sea for and phosphate and Red sea says 0.01 and Hannah says 0.03. I don't know which one to believe. I think I trust the red sea more because there's less room for error.