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Old 08/12/2019, 03:44 PM   #1
FaithKlim
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Hanna Phosphate checker vs Red Sea

I recently purchased the HI713 checker for phosphates; I had been using Red Sea for 2 years prior.

My hanna results are showing .83 - .86 ppm
Red Sea shows .10 - .12

I repeated the hanna test 3 times, red sea twice using identical batch of tank water. Can someone please help me understand this huge discrepancy in results?


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Old 08/12/2019, 06:47 PM   #2
bertoni
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Welcome to the world of hobbyist testing equipment. I have no idea which results, if either, might be more accurate. Are all the animals in the tank doing well enough? You could try getting a Hach PO-19 test kit to see what it says, but it might not be worth the cost.


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Old 08/12/2019, 11:17 PM   #3
FaithKlim
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Quote:
Originally Posted by bertoni View Post
Welcome to the world of hobbyist testing equipment. I have no idea which results, if either, might be more accurate. Are all the animals in the tank doing well enough? You could try getting a Hach PO-19 test kit to see what it says, but it might not be worth the cost.
Yes everything is fine. I battled Dinoflagellates about a year ago & try to keep an eye on my NO3 & PO4; when those bottomed out is when my troubles began. Since keeping those levels elevated, the dinos have stayed away. I use hanna for Alk & Cal testing, thought their phosphate test would be easier than the Red Sea color matching...


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Old 08/13/2019, 06:27 PM   #4
bertoni
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Well, the meter is nice, but all the hobbyist equipment goes through problems from time to time. Since everything is doing well enough, I'd just chalk it up to experience. I can't begin to guess which test might be more accurate, although .8 ppm is very high.


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Old 08/15/2019, 09:49 AM   #5
hkgar
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Consider investing in the Hanna Phosphorus test kit. I use it and have been very pleased with the results and I think it is quite accurate.

Accuracy: Ī5 ppb Ī5% of reading


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180 gallon, 30 gallon sump, 8 80W ATI T5's, MTC MVX 36 Skimmer, Apex controller Aquamaxx T-3 CaRx

Current Tank Info: 2 Barred Rabbitfish, Yellow/Purple, McMaster Fairy, Carpenter, Red Head,Red Fin, Hoevans, Possum, 2 Leopard Wrasses, Kole, Purple & Atlantic Blue Tangs, Matted Filefish, 2 Percula Clown, 4 PJ and2 Banggai Cardinalfish , Swallowtail and Bellus Angel,
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Old 08/15/2019, 03:28 PM   #6
bertoni
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That accuracy rating is fine as long as the reagents are good. If not, then the meter can be far off.


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Old 08/16/2019, 03:28 PM   #7
Uncle99
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Since your tank is not new, the Hanna is a new test and itís results are 8 times normal, Iím thinking the Red Sea May be more correct.

The level of phosphate we keep in our water for corals is very very small and can be difficult to measure accurately with any test, but the Hanna Phosphorus test for UL as suggested by hkgar is a better test.

I have had no luck with Hannaís calcium test, the sample size is so small, results very widely. Used it a couple times, went back to Salifert.

The Hanna Alk checker is great!

If everything is doing well, corals are growing, not overrun by algae, I would discount the Hanna test,



Last edited by Uncle99; 08/16/2019 at 03:37 PM.
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Old 08/17/2019, 02:04 PM   #8
hkgar
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I only test for dKH, Ca and Mag.
Salifert for Ca and Mag and Hanna for dKH.

Once i a great awhile I will test for Iodine


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180 gallon, 30 gallon sump, 8 80W ATI T5's, MTC MVX 36 Skimmer, Apex controller Aquamaxx T-3 CaRx

Current Tank Info: 2 Barred Rabbitfish, Yellow/Purple, McMaster Fairy, Carpenter, Red Head,Red Fin, Hoevans, Possum, 2 Leopard Wrasses, Kole, Purple & Atlantic Blue Tangs, Matted Filefish, 2 Percula Clown, 4 PJ and2 Banggai Cardinalfish , Swallowtail and Bellus Angel,
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Old 08/17/2019, 02:05 PM   #9
hkgar
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I only test for dKH, Ca and Mag.
Salifert for Ca and Mag and Hanna for dKH.
Periodically I will verify my dKH against Salifert and Elos.
Once i a great awhile I will test for Iodine


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Gary


180 gallon, 30 gallon sump, 8 80W ATI T5's, MTC MVX 36 Skimmer, Apex controller Aquamaxx T-3 CaRx

Current Tank Info: 2 Barred Rabbitfish, Yellow/Purple, McMaster Fairy, Carpenter, Red Head,Red Fin, Hoevans, Possum, 2 Leopard Wrasses, Kole, Purple & Atlantic Blue Tangs, Matted Filefish, 2 Percula Clown, 4 PJ and2 Banggai Cardinalfish , Swallowtail and Bellus Angel,
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Old 08/18/2019, 08:22 PM   #10
tkeracer619
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hanna 736ulr checker is the proper one for reef tanks. 713 is not ideal.


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Old 08/19/2019, 05:35 PM   #11
bertoni
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The Hanna ULR Checker is better at the low end of the scale, but both should be accurate within their rated limits given good reagents, just to be clear. I probably would go for the ULR, personally.


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