I had the same issue with red sea, tried elos and it as always 0 but I knew that was not true, tried a hanna po4 and through it in the garbage as well, I had 2 completely diff systems and they both tested exactly the same po4. I have a hanna phosphorus ulr now but I am still uncertain but it seems to be the best thing there is.
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Crap happens, that's why they sell toilet paper in 48 roll packs!
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