Phosphate level testing observations

[Dr B]

Hi,
I am not finding much in the way of actual Hanna phosphate test kit comparisons, short of one study of the Hanna 713 that matched a Hach colorimeter.
So, FYI, I checked my own measurements on my three mixed reefs:

450 gallon tank
713. 0.07
736. 0.021

100 gallon tank:
713. 0.03
736. 0.067

20 gallon tank:
713. 0.21
736. 0.196

Perhaps just interesting information to be used as needed. For my own thoughts, I believe these particular tests are highly accurate, Of course they have a +/- margin of error that is specified to be slightly larger for the 713. I think we are typically looking at values that are so small, that it challenges even the best measuring devices that we utilize. When the phosphate value goes into the higher range near 0.2, then the tests coincide. It makes me think about being skeptical about chasing exacting phosphate levels in the range of 0 to 0.1

 

[Gumbies R Us]

Thanks for sharing!

 

[CHSUB]

It’s a mistake, imo, to think hobby testing is accurate. They should only be used for confirmation with other evidence. An example is “bottom out” nutrients with growing algae of any kind. If algae is growing nutrients are available and plentiful, regardless of hobby testing.