Fauna Marin Reference Solution

[Earl Karl]

Has anyone tested this solution? Especially alk.?

 

[Quietman]

Just did...tested at 6.4 dKH on my Hanna. So it's reading .2 low, the standard says 6.6 dKH

 

[Quietman]

So I looked up the Hanna specs. +/- 0.3 dKH so let's see...math time. So the 6.6 could read as either 6.3 to 6.9. Or the 6.4 dKH reading could either 6.1 to 6.7. Meh. Close enough I guess.

 

[Earl Karl]

That's good enough, as long it doesn't have a +/- 1 dkH lol. Thank you very much.

 

[Earl Karl]

So I looked up the Hanna specs. +/- 0.3 dKH so let's see...math time. So the 6.6 could read as either 6.3 to 6.9. Or the 6.4 dKH reading could either 6.1 to 6.7. Meh. Close enough I guess.

Ok, let's say my tester tested the solution at 4.6 dkH, so a -2 dkH. For 9.5 dkH for my tank, would the tester need to read 7.5 dkH? Or is there any exponential stuff applied?

 

[Quietman]

Are you using a tester (Hanna) or a titration kit (Red Sea or even API)? I ask because my answer will be different...if it's a tester, then it's outside its parameters and shouldn't be trusted. If it's test kits you're interpreting then you could have bad reagents or methods.

 

[Earl Karl]

Are you using a tester (Hanna) or a titration kit (Red Sea or even API)? I ask because my answer will be different...if it's a tester, then it's outside its parameters and shouldn't be trusted. If it's test kits you're interpreting then you could have bad reagents or methods.

I'm using an iDip photometer. It's just an example, my tester is consistent however.

 

[Quietman]

If your test equipment is consistent and within the tolerance stated on packaging measured against a known standard, I wouldn't be too concerned about increasing divergence at higher/lower levels. If it's outside those tolerances and there's no calibration adjustment, I'm not sure I'd rely on it for anything.