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That did the trick... thanks everyone.

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...

Thanks for the suggestions, I decided to tell everyone the pool is closed for the rest of the week and I am presently dumping 60% of the water to take the CYA down to approx 60. I will see if the pool store does testing but I doubt it. I'm not in the US and have not seen metal test for sale...

Thanks for the info, I am using a Taylor k2600 test kit. My water comes from the city supply but it is possible that they source from local wells as this is common in the area.

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...