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Calcium -- A man with two watches . . . .


lonemountain

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As the old saying goes, a man with two watches doesn't know what time it is. I've got both API and Red Sea test kits. My most recent result for Calcium was: API = 440 ppm; Red Sea = 520 ppm. :wacko:

 

I'd tend to believe the Red Sea as it appears to be a better kit and more accurate titration. Any comments or similar experiences?

 

FYI, I get similar differences with phosphate tests using Red Sea and Salifert kits, and the Hanna digital colorimeter. No agreement amongst the three of 'em :furious:.

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As the old saying goes, a man with two watches doesn't know what time it is. I've got both API and Red Sea test kits. My most recent result for Calcium was: API = 440 ppm; Red Sea = 520 ppm. :wacko:

 

I'd tend to believe the Red Sea as it appears to be a better kit and more accurate titration. Any comments or similar experiences?

 

FYI, I get similar differences with phosphate tests using Red Sea and Salifert kits, and the Hanna digital colorimeter. No agreement amongst the three of 'em :furious:.

 

Normal... I have API, Red Sea and Salifert. They ALL read different. These are HOBBY GRADE kits. Not super accurate I am afraid.

 

Doesn't matter though, use one and keep it stable. Stable is what matters, not the exact values (unless they are way out of range).

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yup...set up stock solutions with RO water and use them to get a ballpark estimate, then just use them to monitor rate of consumption so you can dose correctly

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