Waterbear, I am having these issues myself. I am in the process of gradually decreasing the TA with Muriatic acid as it is still at 130. CYA is at 50 so I will need to bring that up as well this weekend after cleaning the cart. I would really like to add Borates as you suggest, however, I have to admit that I am somewhat intimidated by the prospect as I have never dealt with them before. Is there a specific procedure that must be followed? Please advise. Full set of numbers are as follows: TC 4.0, PH 7.6, TA 130, CH 300, CYA 50. 12k gal aggregate finish with bottom jets and spillover spa.