ICP test came in: Own testing is completely off

[Thomasreef]

Hello, first post here :)

my icp test came in and some parameters are off compared to what i tested them myself

ICP:

Magnesium Mg: 1147
Calcium Ca: 342

Own testing:

Ca: 390
Magnesium: 1385

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i use both hanna magnesium and calcium tester + red sea calcium and magnesium tester

anyone have the same issue? It is super tiring having to constantly change my automatic dosing amount because the test is so wrong

 

[Randy Holmes-Farley Verified Community Expert]

What company? I can’t open the pdf in my phone.

 

[Randy Holmes-Farley Verified Community Expert]

Magnesium testing errors is why I recommend not testing it:

https://www.reef2reef.com/threads/just-say-no-to-magnesium-testing-rmm-is-born.1017528/

 

[VintageReefer]

What company? I can’t open the pdf in my phone.

 

[Thomasreef]

What company? I can’t open the pdf in my phone.

Fauna marin in Europe.

 

[Randy Holmes-Farley Verified Community Expert]

Assuming the sample did not freeze before testing, I’d go with the icp value as being more accurate.

 

[Thomasreef]

Magnesium testing errors is why I recommend not testing it:

https://www.reef2reef.com/threads/just-say-no-to-magnesium-testing-rmm-is-born.1017528/

Great link, ill definitely use the Randy Magnesium Method. Do you have any advice for the other testing im doing? Im using the Hanna Marine Master Multiparameter Photometer for most of my testing

 

[dschuffert]

I use Fauna Marin for my ICP testing and have found it accurate. I have also found that Ca and Mg are sensitive to the Hanna checkers and subject to the smallest changes, showing different results.