Hanna Alk reagent

This must effect a wide swath of reagents. I have two with very different lot numbers and very different expiration dates that are both covered under this.

Both ordered from Amazon.

Thanks to the OP for posting this!
 
I'll try and get some info tomorrow. I'm 15 minutes from Hanna. I talked to tech today, asked if I could stop in.
I'm bringing my two bottles with me.
My post from the other thread in the chemistry forum:

My two bottles need replacing.
Just checked Alk.
Hanna 8.736 (156 ppm)
Sarifert 8.9
 
I spoke with Hanna and the issues is with a change they made to their lids. Once the seal is broken the reagent starts to react with the lid and then goes bad over time. They could not tell me how long before the accuracy degrades but could only say that the first test would be accurate and thought it would remain accurate for a few days. As time goes by, you will get lower readings than what your tank is at.

Hope this helps.
 
urbaneks said:
I spoke with Hanna and the issues is with a change they made to their lids. Once the seal is broken the reagent starts to react with the lid and then goes bad over time. They could not tell me how long before the accuracy degrades but could only say that the first test would be accurate and thought it would remain accurate for a few days. As time goes by, you will get lower readings than what your tank is at.

Hope this helps.
Click to expand...


Wow. That is even worse than I thought. I figured it was probably constantly off. Being inconsistently off is much worse. I'll have to go out and buy another alk Kit.
 
Urbaneks, thanks for the info. I have two reagents (both bad) one opened 11-24-15, the other 1-7-16, the one from November reads 2ppm higher. Seems within reason to me.
 
Seems like some people report large disparities between the checker and other tests and others see little difference. If the foil is what causes the problem then perhaps by removing all of it those reagents stay good longer?
 
SoloGarth said:
Seems like some people report large disparities between the checker and other tests and others see little difference. If the foil is what causes the problem then perhaps by removing all of it those reagents stay good longer?
Click to expand...

SG, Yes it's the plastic on the foil seal that's interacting with the reagent.
If you remove it all, store the bottle upright, it will be better.

The new "Passed" reagent has the foil seal, but is not plastic lined.

See my conclusions and test results here. http://www.reefcentral.com/forums/showpost.php?p=24291771&postcount=35

PS... Nice riding country out your way. I'm always up in Barre. Brought my bikes from Higgins Power Sports. I'm 10 minutes due east from Providence RI.
 
Member No. 1 said:
SG, Yes it's the plastic on the foil seal that's interacting with the reagent.
If you remove it all, store the bottle upright, it will be better.

The new "Passed" reagent has the foil seal, but is not plastic lined.

See my conclusions and test results here. http://www.reefcentral.com/forums/showpost.php?p=24291771&postcount=35

PS... Nice riding country out your way. I'm always up in Barre. Brought my bikes from Higgins Power Sports. I'm 10 minutes due east from Providence RI.
Click to expand...


Ok. Yeah I remove all of the foil from my bottles. But who knows.

Yeah it's nice up here. Particularly in the summer. Long winding roads.
 
So I ordered a new reagent and recieved it today. This one is bad too. They need to pull these from the shelves. If they know they are bad they need to be more proactive. Super frustrating.
 
I believe if there's a green dot or marking it is still good. I just read about it at RC and I will try to find the link.
 
SoloGarth said:
So I ordered a new reagent and recieved it today. This one is bad too. They need to pull these from the shelves. If they know they are bad they need to be more proactive. Super frustrating.
Click to expand...

I ordered direct from facility in RI. Hanna has a website as well great prices too
 
Maximus said:
I believe if there's a green dot or marking it is still good. I just read about it at RC and I will try to find the link.
Click to expand...


I'm not sure how a green dot overrides the Hanna website stating the reagent is bad? The known bad ones I am sure passed at the time.
 
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