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I just tested our pool with my newly arrived TFT kit and got a TA reading of 210, when I test with my Taylor K-2006 kit (1.5 years old) I get a TA of <75. Would old chemicals not give me a falsely high result instead of a low one? I do notice that the drop sizes from the TFT kit R-0009 do look...

Good morning all, First time posting after reading a lot of good information. Last week we fired our pool company after testing the water and finding every parameter out of range and having black algae around the bottom perimeter and sporadically over the bottom. CYA ~200, FC 2.5, CC 0, TA...