Red Sea Po4 kit

[member 99594]

I just wanted to know if anyone has done the Po4 kit low range and high range with the same sample.

I did the low range and got .08 and right after did the high range and got .17

Is there a reason this would be happening and do the salifert kits test better for Po4?

thanks all in advance.

 

[Saltyreef]

The high range isnt an accurate way to measure your .08 p04.
If its .08 at the low range the high range could show a slight color instead of clear. There is an error factor.
If you want to be as accurate as possible, invest in a hanna.

Fwiw i will test with my low range first, and if its ever right on the edge of the test kits limits, thats the only time i would use the high range to verify if its any higher.

 

[member 99594]

Thank you. I usually use the high range nitrate because I usually get a dark reading anyway. So I look for a slight pink on the high range.