I don`t think po4 shows up on tds meters so even if you have 0 tds you could have po4
I had a hanna phosphate checker and it was a POS, I thru it in the garbage, I have ordered a hanna phosphorus ulr as i read they are much more accurate, they measure ppb phosphorus which is mathematically converted to po4
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Crap happens, that's why they sell toilet paper in 48 roll packs!
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