For some context, I am out of reagent packets for my hanna checkers and went to my LFS to test phosphates, 4 days ago my phosphates measured 0.04, and since they also ran out of packets they used the red sea phosphate pro, it is giving us readings of , 0.16 on low range and 0.68 on high range, which makes no sense. and since neither of us trust the red sea phosphate test I want to know what you think? Faulty reading? I don't have any fish in my tank and am running some GFO, I also wanted to add a wilisoni today and, if these readings are accurate, wanted to know if it will be fine in my system. Either way do you know a more accurate way to test this?
Low range
High range
Low range
High range