Hanna vs. Salifert?

[radiata]

Boomer,

Was there any resolution to the question of accuracy for the newer Hanna Alk tester vs. the older Salifert Alk test kit?

Thanks,
Bob

 

[Boomer]

No Bob, other than my recent post on it. Did you miss it ?

Bob, so sorry I'm so late to rely

There is more to the story after re-looking at Dana's article and talking to a Habib and Chris. I guess I forgot to post it here.

Guys I spent allot of time with Habib from Salifert and we are not out of the water yet, so will reply here more soon. I l also talked to Chris Jury about it. This whole Hanna and test done by my friend Dana seems to be a big mess. It appears the Salifert is right on and does read higher than the Hanna and is suppsoe to. That means the Hanna is more accurate than the HACH test done in the article. In Alk testing there is a serious issue between CO2 in FW and CO2 in SW. Also, the titration end point is not the same at high Alk as it is low Alk. I looked at Millero Labs (the only place to test a Alk kit for seawater) data sheets on the testing of the it and it is +/- 0.1 dKH within NSW on his reagents. I will try to get Habib to reply to this thread. He is thinking of doing a full blown article for Advanced Aquarist to clear up all this Alk mess we have always had to deal with. I have said for years the Sailfert is the best Alk test and it now seems to being proved me right again but have had my doubts from posted Salifert values and Dana's article. I too have been led astray.

This is who Dr. Frank Millero is

http://cdiac.ornl.gov/oceans/

http://www.rsmas.miami.edu/people/fa...=frank-millero

http://www.amazon.com/dp/0849384230/?tag=reefs04-20

 

[cryptics]

Boomer,

I am now confused. I use the hanna Alk tester and like it because it seems acurate in the way if i test the same sample multiple times I get the same or very close results. With the tester it says to take the number I get and times it by .056 to get dkh. After reader one of your posts on this you seemed to come up with times .082 to get dkh. I have been using your method the last few weeks. Are you saying the .082 is off some now and it is somewhere in between .082 and .056? It may be because i am at work but my head hurts after reading the previous post Any clarification would be greatly appreciated.

 

[Boomer]

No cryp that is not what I'm saying. That .056 is a conversion from ppm to dKH. So, take that meter number and times 0.82 (NOT .082) and that times .056. The 0.82 is how far this meter seems to be off from a real Alk measurement. Look at the article by Dana Riddle on this meter and my remarks here.

So, it the meter reads 150, then 150 x .82 x .056 = 6.88 dKH

http://www.manhattanreefs.com/forum/chemistry/117089-hanna-alkalinity-checker-reading-high.html

 

[cryptics]

Thank you. I've got it now. Have you done any research about the Hanna Calcium?

 

[Boomer]

No, nothing on the Ca meter but I do not think it looks good, due to its operation.

 

[cryptics]

From what I read it is accurate if you follow the directions to a tee but I am not completely sold. Before using the Hanna I was using Elos. I didn't trust it much because no matter what it always gave me a reading of 450. The Hanna is significantly higher reading 550-575 range but does seem to go down between water changes which i did not see in the elos. I get the feeling that the Hanna is consistent but high and at some point we will be able to do something like you suggested for Alk and just offset the results.
Do you have a suggestion for Calc test kit that is accurate? I would like to run the hanna in conjunction with a proven kit to map results.

 

[cryptics]

Thank you so much for your help with this!

 

[Boomer]

Randy and I always used the HACH Hardness kit.

 

[cryptics]

Thank you I ordered the B1 should be here Monday or Tuesday

 

[Boomer]

That number makes no sense. You want the Hardness
kit (total and calcium) HA-4P MG-L . $75.09.

 

[cryptics]

I did get the Hardness kit Is there more than 1? Found it on Amazon

Hach 5B 5-B Hardness Test Kit 1453-00, 1-30 Grains/Gallon GPG
http://www.amazon.com/gp/product/B0051V5580/?tag=reefs04-20

 

[Boomer]

Yes, they make a half - dozen of them. Hardness is calcium and magnesium. Even if it did calcium only it is not high enough.

30 x 17.1 x . 40 = 205 ppm as calcium.

 

[cryptics]

Damn so the one I got won't work. I will get the other one.

 

[Boomer]

No, it will not measure Calcium Hardness, just Total Hardness. If you get the other one let me know, as I will need to explain dilution stds to you so you can test higher levels of Ca++ and Mg++, as you will need to. It is very easy.

This is the kit

Hardness (Total & Calcium) Test Kit, Model HA-4P MG-L
http://www.hach.com/hardness-total-calcium-test-kit-model-ha-4p-mg-l/product?id=7640219512

This should be the one you ordered.

Total Hardness Test Kit, Model 5-B
http://www.hach.com/total-hardness-test-kit-model-5-b/product?id=7640219508

all of the HACH Harness kits
http://www.hach.com/total-hardness-test-kit-model-5-b/product?id=7640219508

This is the one I use to have and gave it to Randy, which does not need to use dilution stds.
http://www.hach.com/hardness-total-calcium-test-kit-model-hac-dt/product-details?id=7640219514