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How accurate are the Tetra Test Strips?


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From my personal experience, they are not. I used test strips for the first 3 months back into the hobby in January. I always tested 0 nitrite and 0 nitrate, every single time. I found it odd as I suspected I'd screw things up as I hadn't been in the hobby for a decade.

When I got an API test kit in April, suddenly I'm always seeing a minimum of 20ppm of Nitrate coming out of my well water while also seeing 0.25ppm ammonia consistently coming out of the well too. The test strips didn't catch that.

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