Just tested this morning (the water is still green and cloudy but perhaps a shade lighter). TA was still 100 and ph was still low off the scale (below 7). I did add a cup of Borax. Chlrine was fine at 5 and my kit indicated no calcium hardness (the sample did not turn red after adding the agent so didn't bother to add the other drops to make it turn blue. Should I?). I have no way to test for copper or iron so will take a water sample to the pool store as soon as they open.

Forgot to mention last night that the baking soda does seem to have left a soapy film on top of the water. Not sure if that matters or not.