jimlin June 16, 2013 Share June 16, 2013 seachem test kit Link to comment Share on other sites More sharing options...
Tink June 16, 2013 Share June 16, 2013 I know this response isn't an answer to your question exactly, and I apologize for that ahead of time. I highly recommend the Hanna low range PO4 tester, that thing has made my testing procedure MUCH more accurate, and very easy (once you get the hang of the Hanna test procedure that is). My best guess for the above is .1ish Link to comment Share on other sites More sharing options...
Jason Rhoads June 17, 2013 Share June 17, 2013 Wow, that is a tough one. I can only say somewhere between 0 and .2 Link to comment Share on other sites More sharing options...
netpez June 17, 2013 Share June 17, 2013 Looks like 0.1 to me... Of course I am so bad at differentiating colors .. Link to comment Share on other sites More sharing options...
Origami June 17, 2013 Share June 17, 2013 I tried something new here just for grins. Figuring that we often judge colors by their saturation (light and dark first) as well as their hue, and not finding an exact match by taking a "chip" from the sample using Paint software and sliding it across the color chart, I decided to look at the ratios of the pigments by taking your picture and running "Instant Eyedropper" across it to determine the RGB composition and to look for something that came reasonably close to matching the relative percentages of red, green and blue when comparing the sample to the test strip. Whether or not this is a reasonable approach, the best that I could come up with using it was about 0.065 ppm. Link to comment Share on other sites More sharing options...
Jason Rhoads June 18, 2013 Share June 18, 2013 darn Tom, you just blew my mind! Innovative use of photo editing technology Link to comment Share on other sites More sharing options...
jimlin June 18, 2013 Author Share June 18, 2013 wow, thanks tom. Link to comment Share on other sites More sharing options...
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