I have created quite a mess with my 225 gallon hot tub .
The SWG stopped working, so I inserted an old SWG from my above ground pool. After a few days I tested the water using the Taylor K-1000 test kit. The TC turned orange, with suspended "clots" and the pH turned bright purple. I reduced the SWG run time from 12 hours a day to 6 hours a day. I added 2 tablespoons of ph minus, but the pH test remained bright purple. I had to travel for a week and when I returned there was rust forming on the nozzles. I performed a Chlorine Drop Test and Total Alkalinity test using the TF-100 kit.
TC > 100 ppm
TA 0 ppm