who uses Hanna phosphate meter

[Delphinus]

Interesting. I wonder if the meter can measure organic phosphates as opposed to the inorganic phosphates that get measured by the test kits. If so then that would be awesome.

(If I remember my reef chemistry {which I might not, but, ...} Supposedly test kits can only test for INorganic phosphate, whereas the problem phosphates in our tanks is the organic phosphate. We test our tanks in the hope/assumption that there is some correlation between the two in suspension {which might be a BIG assumption}.)

Even if the meter measured the same thing as the test kits, and one ran rowasphos/phosban it might still be worthwhile tool to tell you when it's time to replace the media. I guess it depends on how expensive the tool is though.