PO4 test kits - Hanna VS Salifert

[Ryanerickson]

I tried mindys method it gets me way lower results, 4-6 ppb so almost none existent I'm also questioning if this method is correct as its not what the instruction say to do,
I also watched a video they did not use this method either.
How did you get this method for testing mindy?

[Myka]

Originally Posted by gregzz4

Mindy, have you performed back to back tests to see if your procedure gives you a different reading than the instructions' procedure would?
One test your way and one test the Hanna way?

What I gather is the full countdown allows any un-dissolved powder to settle before it takes the reading.

I've never watched their videos - actually I didn't know they made any. I'm not sure what I'm doing differently from "the Hanna way"? Could you explain? The method I use is one that is very common with the "purists" (lol) on Reef Central and Reef2Reef, and supposedly the proper way to do it.

I never get undissolved powder, so I'm not sure what's up with that. However, the countdown is for color development.

Originally Posted by Ryanerickson

I tried mindys method it gets me way lower results, 4-6 ppb so almost none existent I'm also questioning if this method is correct as its not what the instruction say to do,
I also watched a video they did not use this method either.
How did you get this method for testing mindy?

See above. What am I doing different?

[Ryanerickson]

Well in the instruction from what I understand you poor the powder into vial right after c2 is displayed when it's dissolved you add to unit and hold botton tell 3:00 countdown starts.

[Ryanerickson]

I prefer your method as its easier but what's right

[Myka]

Originally Posted by Ryanerickson

Well in the instruction from what I understand you poor the powder into vial right after c2 is displayed when it's dissolved you add to unit and hold botton tell 3:00 countdown starts.

My instructions say to mix the cuvette for 2 minutes, then start the 3 min countdown.

[Ryanerickson]

Mine don't neither do any videos I've watched

[Ryanerickson]

What I'm trying to say is they say to replace vial before 3 minute count down