Im planning on adding borates to my pool for the first time. Im planning on using Borax and muriatic acid using the Pool Math calculator. I was planning on using the formula to add 40ppm to have some play. Does anyone have any tips before I do it? My TA was over 300 at one time but I have gotten it down to 90. Will a TA of 90 be ok or should I lower it more? Can I add All the MA and Borax (separately of course) at one time? Which First? Thanks