I don't know what I'm doing wrong but I cannot drop my TA. My TA is 180+ and every attempt at lowering it drops my PH way low. Ive maybe seen around 125-130 at the lowest but my PH is then super low in the mid 6's. When I raise my PH to 7.4ish my TA is again off the charts. I'm using Spa up and Spa down but both seem to either drop or raise both TA and PH even after the aerating my ph is dropping with the TA. My local spa dealer can't figure it out, they've done 4 empties and refills in the 6 months I've owned the tub. I was using a Bromine system but switched to Chlorine Spa 56 for my sanitizer. Any suggestions?