Hanna ULR Phosphorous Test

[malx]

Hi, All.

Am I doing this right? I just got a Hanna ULR Phosphorous Test Kit and it says my phosphorous is 200. When I convert that with their chart, that's 0.6ppm or over.

With that said, the last ICP test I checked my phosphates were at 0.3ppm and were on a downswing.

Could this test kit be that off? I just sent in another ICP test just in case and did a 30% water change as a precautionary measure, but I wanted to ask what you guys thought.

Let me know!
Joey

 

[rjjr1963]

I think the Hannah error variation is .04

I would trust the Hannah test more than the others. Just make sure you mix for the full two minutes.

 

[Bent]

What is the no3?
How old is the tank?
What is your bioload?
How much/what do you feed?
Do you have a lot of algae growing?
What kind of skimmer do you have?
What’s the total tank water volume?
How much skimmate are you making?

If I kept getting results like that I would start doing a complete assessment of your nutrient intake and output. With levels that high it has to be coming from somewhere and not being removed quickly enough.