Hanna dKH New Versus Old Regent Difference

Big Mistake

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Sometime ago (3/12/23) I ordered Alkalinity Reagent for my Hanna Colorimeter.

It arrived with an expiration date as of 10/2023.

I have been using it. My dKH has been dropping off ...

Recently I needed to order supplies including more Tropic Marin All-For-Reef so I ordered a new bottle of reagent.

Came with an expiration date of 01/2025.

Out of curiosity I had to see if they agreed.

Old reagent reports dKH of 6.8.

New reagent reports dKH of 8.2.

I have run the experiment twice and the delta is consistent.

Red Sea titration kit (very old) is a completely different number like 3.8?

I am just going to believe the new value as it is the number I want.

Is that not the basis of science? Cherry picking the data to agree with your confirmation bias.

I thought someone sold dKH check packets? Don't get me started about my Hanna Salinity checker. Complete trust.

ICP test?

Ugh, as the days go by, I will just accept the results until I order more but that might be a ...

-Big Mistake
 
Sometime ago (3/12/23) I ordered Alkalinity Reagent for my Hanna Colorimeter.

It arrived with an expiration date as of 10/2023.

I have been using it. My dKH has been dropping off ...

Recently I needed to order supplies including more Tropic Marin All-For-Reef so I ordered a new bottle of reagent.

Came with an expiration date of 01/2025.

Out of curiosity I had to see if they agreed.

Old reagent reports dKH of 6.8.

New reagent reports dKH of 8.2.

I have run the experiment twice and the delta is consistent.

Red Sea titration kit (very old) is a completely different number like 3.8?

I am just going to believe the new value as it is the number I want.

Is that not the basis of science? Cherry picking the data to agree with your confirmation bias.

I thought someone sold dKH check packets? Don't get me started about my Hanna Salinity checker. Complete trust.

ICP test?

Ugh, as the days go by, I will just accept the results until I order more but that might be a ...

-Big Mistake
I would trust the results garnered through the use of the new, unexpired reagent, and would not consider that to be "cherry picking".
 
You can check the alk of fresh salt mix to compare. You can easily find it for a bunch of salts
 

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