Hanna Alkalinity Reagents

[MT_is_a_Pisces]

What is the shelf life for Hanna alkalinity reagents after opening?

dKH in tank has been dropping. Increased 2-part alkalinity dosing.
And still had a reading that was under 7.

Purchased a new box and reading was 10.5 dKH

 

[STEEZY]

What was the lot number? This exact same thing, including the same numbers that happened to me. I verified with another test kit and 10.4 was accurate for me. The low one was lot 160 I believe.

 

[Geebs19]

I e heard storing the dkh reagent in the fridge makes it last longer

 

[CryptoNautical]

I store mine in the fridge after opening. I've had them freeze (Living in Alaska does that to things) and still had no issues.

 

[gbroadbridge]

What is the shelf life for Hanna alkalinity reagents after opening?

dKH in tank has been dropping. Increased 2-part alkalinity dosing.
And still had a reading that was under 7.

Purchased a new box and reading was 10.5 dKH

According to Hanna the life once opened is approximately 3 months.

They do not recommend refrigeration, however @Lasse and others including myself find that it extends the shelf life a great deal.

 

[Lasse]

Here

Important findings according how to store open bottles of the reagent for Hanna Marine alkalinity checkers

There is a way to hinder the Hanna alk to show lesser and lesser dKH (or ppm for that matter) with age of open reagent bottle. I had the same story as many have reported here - my reading decrease from a new open bottle with time. Double check with another method show that there was not a real...

www.reef2reef.com

Sincerely Lasse

 

[gbroadbridge]

Here

Important findings according how to store open bottles of the reagent for Hanna Marine alkalinity checkers

There is a way to hinder the Hanna alk to show lesser and lesser dKH (or ppm for that matter) with age of open reagent bottle. I had the same story as many have reported here - my reading decrease from a new open bottle with time. Double check with another method show that there was not a real...

www.reef2reef.com

Sincerely Lasse

Thank you Lasse, could not find the old thread to link.

 

[DE FISH]

Oh no not another thread regarding this issue.

fridge works it’s always worth keeping one test and comparing the results to a new batch number to get an idea on the variance