You do not need to replace every year. And, you are right. Storing them in a cool, dark place does help to prolong the life. DPD eventually does go bad. You will be able to tell. It will get gray and clumpy.
Re: Replacing old reagents in Taylor test kit
You do not need to replace every year. And, you are right. Storing them in a cool, dark place does help to prolong the life. DPD eventually does go bad. You will be able to tell. It will get gray and clumpy.
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