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The question is did you document your levels at least once a day during the 14 days?Just being constructive here, but I have run the test a dozen or so times in buckets of saltwater, mixed up per hotricksndosage guide just to confirm the numbers in paper match up with the test. Have yet to find any discrepancies. For example, if I mix up 5 gallons and out enough in there on paper to get it to 1.5, the test showed 1.48-1.53 .
Ran this test twice on lfs holding tank, and that is what I got . Instantly turned the reagent a dark color, before hitting the test chamber for Hannah.
As for you finding it unlikely to be that high... have you owned an lfs or any type of facility where fish are constantly being sold?
When they have to top off the water sold, vs evaporations, any given day they can evaporate 3-4 gallons, and sell 20-30 gallons based on how many bags of fish sold.
Without measuring, they could very easily replace 30 gallons worth of copper, when it only really needed 20 gallons worth. Do this 6 days week, and I think it’s fair to say the level can rise or sink fast.