problem with hanna phosphorous ulr

[redadeath]

i got newely setup tank
i checked phosphate with api test kit it gave me 1 mlg phosphate

while checking with hanna phospahte checker i got 15 phosphorus

i dont know if it is faulty unit or what?

 

[bertoni]

Which Hanna unit are you using? There are two checkers. One is the Phosphorus ULR Checker, and the other is the Phosphate Checker.

 

[karsseboom]

Which Hanna unit are you using? There are two checkers. One is the Phosphorus ULR Checker, and the other is the Phosphate Checker.

The title says ULR


I wouldn't trust the API test kit, there garbage when it comes to reading low range po4

 

[BeanAnimal]

To convert from ppb phosphorus to ppm phosphate:

Multiply the reading by 3.067 and then divide the result by 1000.

So

15 x 3.067 = 46.05

46.05 / 1000 = .0465 ppm phosphate

Approaching high but not terrible. That said, the hanna checkers are not at all reliable or repeatable. I took several sachets from at least 6 different lots, labeled them and then randomly used them to test a common sample of tank water. The lot numbers were fairly easy to spot on the chart. None of the lots were expired and each test was blind. Volume measurement was done with a 10ml pipette (ebay).

I did something similar with the ALK checker reagents and the results were also similar.

 

[Dr. Reef]

if u need a copy of this excel file send my a pm.

 

[BeanAnimal]

Almost forgot, I built a small jpg table

 

[bertoni]

Given the accuracy limit of those test kits, the numbers are close enough. I might consider some sort of phosphate reduction, maybe GFO.