Hanna checker for phosphates

ZachP · Dec 12, 2016

I'm looking into getting a Hanna checker for phosphates but not sure which model to get. Do I get the phosphate low range or the phosphorous ultra low range?

Diesel · Dec 12, 2016

The low range is good enough, it will tell you PPM (part per million) the ULR with tell you PPB.

Randy Holmes-Farley · Dec 13, 2016

IMO, I'd get the ULR HI 736. It has lower inherent error.

griff500 · Dec 14, 2016

ULR 736.

ZachP · Dec 17, 2016

Thank you everyone. I ended up going with the ULR. I don't mind doing a little math to get better accuracy

Randy Holmes-Farley · Dec 17, 2016

Sounds good.

Happy Reefing.

Terry4505 · Dec 17, 2016

I use the ULR, and enter the number into Apex Fusion, which does the math for me. Same with the Hanna Alk checker

BlueCursor · Dec 22, 2016

I started off with the low range and migrated to the ultra low range. The two don't match very well. I will get a reading of 0.00 ppm with low range and 16 ppb (0.05 ppm) with the ultra low range. Annoying!

Currently I don't care so much about PO4 readings so I use low range and if it's 0.05 or lower I am happy. If it's over 0.05 I don't really care anyway because I don't have an algae issue.

Randy Holmes-Farley · Dec 22, 2016

BlueCursor said:
I started off with the low range and migrated to the ultra low range. The two don't match very well. I will get a reading of 0.00 ppm with low range and 16 ppb (0.05 ppm) with the ultra low range. Annoying!

Currently I don't care so much about PO4 readings so I use low range and if it's 0.05 or lower I am happy. If it's over 0.05 I don't really care anyway because I don't have an algae issue.

That agrees within the stated accuracy. The low range range reads +/- 0.04 ppm, so if the value is 0.04 ppm, it could read anywhere between 0.00 and 0.08 ppm.