Corbidorbidoodle Posted March 9, 2022 Share Posted March 9, 2022 So, you know how on test strips, a couple of the squares you read right away, and a couple of them you read after 30 seconds... But how long after they come out of the water are they still accurate? Like, a minute or two? I'm thinking specifically of the nitrates square. At 30 seconds they don't show any nitrates. But after about a minute they show about 40 ppm. Link to comment Share on other sites More sharing options...
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