Making sense of Phosphate readings

[asylumdown]

well what's weird is that I've always run GFO and have had very low phosphate for the entire life of the tank. However, I haven't had the ULR test kit for very long, I was using the regular hannah checker which would routinely show me having no phosphate. But now with the ULR kit, I'm not sure if my results are 'real' or if they're the natural variation in responses I'd get from not doing the test exactly the same each time.

[MarkoD]

I have been running zeo for 3 weeks and my phosphates are at .35ppm as per the Hanna checker

[mark]

simple as the Hanna testers are, drift you're seeing could be just errors in testing

[Magickiwi]

Originally Posted by mark

simple as the Hanna testers are, drift you're seeing could be just errors in testing

+1 I think those are pretty good #'s for Hanna testers. They are only advertised +/-5% accurate and I would be very surprised if they are really that accurate.

[Proteus]

I thought I was having po4 issues as my red sea kit was reading upwards of 0.16.
Today I tested against elos and salifert and both showed 0.03 or less