here are my reading (TH) 100 (FC)3/6 (PH) 6/8 (TA) 80 (CYA) 0
Could not find any 20 Mule Team Borax look at Home Depot, Walmart so I purchased a container from walmart with Stabilizer-Conditioner..written on it. HTH I know you said not to but that was all they had
Have only used Bleach as you said.