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I did the ascorbic acid treatment last Sunday, and added 3 lbs of Vitamin C and the stains did not come out until the next morning when I added the metal sequestering agent. The good news is that the pool is completely white. After the treatment the ph dropped from 7.2 to 6.8, and I adjusted...

I did the cy test and the black dot remained clearly visible. so I guess this means my cy is 0??? fc o ch 50 ta 110 salt 1100 what do I adjust first?? And do I adjust all before shocking?? Pool is pretty clear with some algae.