Red Sea Nitrate Readings

[aadair22]

Hello,

So it seems that every time I test my nitrates with the Red Sea Pro kit, I get a reading of >10 on the low range, but <4 when I test the high range.. 4ppm and 10mm are pretty close colors on the chart, but seems closer to 10 than 4..

Has anyone had experiences like this?

 

[bavass]

I never tested my trates with the high range unless they were higher than 4ppm. Did you run the tests differently? The way you do the test is not the same for high range