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08/12/2019, 03:44 PM | #1 |
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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? |
08/12/2019, 06:47 PM | #2 |
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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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Jonathan Bertoni |
08/12/2019, 11:17 PM | #3 | |
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Quote:
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08/13/2019, 06:27 PM | #4 |
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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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Jonathan Bertoni |
08/15/2019, 09:49 AM | #5 |
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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: ±5 ppb ±5% of reading
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Gary 180 gallon, 40 gallon sump, 3 250 W MH + 4 80W ATI T5's, MTC MVX 36 Skimmer, Apex controller Aquamaxx T-3 CaRx Current Tank Info: A 2 Barred Rabbitfish, Red Head Salon, Yellow/Purple, McMaster Fairy, Possum, 2 Leopard Wrasses, Kole, & Atlantic Blue Tangs, 2 Percula Clown, 3 PJ and 1 Banggai Cardinalfish , Swallowtail, Bellus and Coral Beauty Angels |
08/15/2019, 03:28 PM | #6 |
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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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Jonathan Bertoni |
08/16/2019, 03:28 PM | #7 |
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Since your tank is not new, the Hanna is a new test and it’s results are 8 times normal, I’m 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 Hanna’s 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. |
08/17/2019, 02:04 PM | #8 |
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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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Gary 180 gallon, 40 gallon sump, 3 250 W MH + 4 80W ATI T5's, MTC MVX 36 Skimmer, Apex controller Aquamaxx T-3 CaRx Current Tank Info: A 2 Barred Rabbitfish, Red Head Salon, Yellow/Purple, McMaster Fairy, Possum, 2 Leopard Wrasses, Kole, & Atlantic Blue Tangs, 2 Percula Clown, 3 PJ and 1 Banggai Cardinalfish , Swallowtail, Bellus and Coral Beauty Angels |
08/17/2019, 02:05 PM | #9 |
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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, 40 gallon sump, 3 250 W MH + 4 80W ATI T5's, MTC MVX 36 Skimmer, Apex controller Aquamaxx T-3 CaRx Current Tank Info: A 2 Barred Rabbitfish, Red Head Salon, Yellow/Purple, McMaster Fairy, Possum, 2 Leopard Wrasses, Kole, & Atlantic Blue Tangs, 2 Percula Clown, 3 PJ and 1 Banggai Cardinalfish , Swallowtail, Bellus and Coral Beauty Angels |
08/18/2019, 08:22 PM | #10 |
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hanna 736ulr checker is the proper one for reef tanks. 713 is not ideal.
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Hobby Experience: 9200ish gallons, 26 skimmers, and a handful of Kent Scrapers. Current Tank: Vortech Powered 600G SPS Tank w/ 100gal frag tank & 100g Sump. RK2-RK10 Skimmer. ReefAngel. Radium 20k. |
08/19/2019, 05:35 PM | #11 |
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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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Jonathan Bertoni |
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