Hanna Phosphate Checker
- Thread starter helldiver
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Phosphorus URL HI736 reads in ppb and the Phosphate HI713 that reads in ppm.
I use the Phosphorus HI736 and when you get your reading (mine was 7 this morning). You need to do a mathematical calculation to get the reading for Phosphate in ppm.
Phosphorus result multiplied by 3.066 then divided by 1000 equals phosphate.
7 x 3.066 / 1000 = .021462
I use the Phosphorus HI736 and when you get your reading (mine was 7 this morning). You need to do a mathematical calculation to get the reading for Phosphate in ppm.
Phosphorus result multiplied by 3.066 then divided by 1000 equals phosphate.
7 x 3.066 / 1000 = .021462
First off what is displayed on the Hanna checker would be 7, after the equation is done that I do on my own all I look at is the two digits after the decimal point... 0.02
736 is more accurate then the 713 when it comes to low phosphate readings.
The choice is a possibility less accurate result (not a lot) and have the Hanna checker give you a reading, or more accurate results and have to do a simple math equation.
You know which meter I went with [emoji6]
736 is more accurate then the 713 when it comes to low phosphate readings.
The choice is a possibility less accurate result (not a lot) and have the Hanna checker give you a reading, or more accurate results and have to do a simple math equation.
You know which meter I went with [emoji6]
RJinPV
Active Member
Resolution is different than accuracy. The HI713 has an accuracy of 0.04 ppm phosphate. The HI736 accuracy is +/-5 ppb phosphorus so the accuracy in phosphate is 0.015 ppm. This is really only ~2x more accurate than the HI713, which has made me reluctant to go spend the $50 to get one. However, I often just get a reading of 0.00 ppm with the HI713 and I have no confidence the reagents are good. I am still battling algae problems even when my HI713 meter says 0.00 ppm. That makes me want to get something with more resolution so I can at least get a reading and know it's working. If I had it to do over I would get the HI736.
BOMPH
Community Member
The .04 margin of error on the 713 is what drove me nuts. I would read 0, .02, .05 in 3 consecutive teststests, and that was consistently repeatable. Once I switched to the 736, I saw extremely close readings, generally 1 off, if at all. Less margin of error it would seem.
RJinPV
Active Member
I think I might be $50 poorer soon. My weekly test with the HI713 just came up 0.00 PPM again.
BOMPH
Community Member
I hope you find the source of your algae issues. I have found a good substrate cleaning does wonders for me. If I see anything (usually cyano for me), its the first thing I do, because my numbers are always in line
RJinPV
Active Member
Its gradually getting under control. I've learned how to measure and control phosphate and NO3 and I started to use a toothbrush and other methods to remove it. I should do more substrate cleaning though. Thanks for the tip
OP
OP
helldiver
Well-Known Member
On 713
Yes i am noticing on back to back reading. There is a .05 didference that is alot in my opinion it is driving me nuts also i also read somewhere it is not a true phosphatw reading. Because it is not reading true phos
Yes i am noticing on back to back reading. There is a .05 didference that is alot in my opinion it is driving me nuts also i also read somewhere it is not a true phosphatw reading. Because it is not reading true phos
corey01
Active Member
not to derail this as its not my thread but I have the 713 regular phosphate checker. and with its resolution of +/- .03 as long as i get a reading of 0.00 isnt that good enough? or do I need to go and get the low end checker ? ive always just assumed that its ok as long as it is within that range. I normally change my GFO when I get a reading on my checker. is this alright? or am I doing it wrong?
Chris Adams
Valuable Member
Personally I never had a reading other than 0 with 713
Bought the ULR which is providing #'s in the .03 - .05 range generally
Bought the ULR which is providing #'s in the .03 - .05 range generally
jd371
Valuable Member
It's a real small amount, if I remember correctly 0.1ml. I stopped using it because I wasn't happy with the results, it would always read higher when compared to Salifert and Red Sea.
OP
OP
helldiver
Well-Known Member
ty I just used it every once in a while
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If you ask Hanna which one to buy, they will tell you the ULR one.
It is designed for marine use only, whereas the other one is not.
The ULR one even says marine on the checker, the other does not.
It is designed for marine use only, whereas the other one is not.
The ULR one even says marine on the checker, the other does not.
