DC2 Posted September 19, 2021 Share Posted September 19, 2021 I've been using a big name test strips and fighting to get the nitrates down because they were always at 80ppm. I just started using the Co-op's strips and the nitrates are 10ppm so I tested with the kit. The Co-op's strips are right. 3 Link to comment Share on other sites More sharing options...
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