Oreganoodle Posted July 21, 2022 Share Posted July 21, 2022 3 days ago or so I was about a week out from my last water change but also had a lot going on that night so decided just to test the nitrates to decide if the water change could wait. Got a reading between 10-20 on API freshwater master, and decided I could wait a few days. Fast forward to last night - I open a new testing kit b/c my last one was running low and I wasn't sure if it had 10 drops left in each bottle. 5 ppm. I hadn't touched the water in between (not even a top-off). I thought I must be tired/doing it wrong so I tested again -- same thing. So I went to bed and then tested again today. I used both tests this time (low-and-behold I did have 10 drops in the older kit). Sure enough - the kit I've been using for awhile says between 10-20 and the new kit says 5 ppm. The are both unexpired, and both the same exact brand. I've run the 5 ppm one three times total and it always is a very clear 5 ppm. Which would you trust? Link to comment Share on other sites More sharing options...
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