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Discussion Starter · #1 ·
I have had my water testing kit for about 2 years now and I was wondering how often you should replace them. I currently have the kind you have to mix yourself. Little glass beaker and so on. Just curious.
 

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Two (2) years shouldn't be too long!

If you use the API nitrate kit, be sure you shake the reagent #2 VERY hard for at least a minute before adding it to the test vial!
 
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