Hello for a while now my PH has always been at 7.8. I have been adding 14.5 muriatic acid to reduce but I never see any noticible change. I use the tf100 test kit and pool calculator to determine amount to add. For instance in Tue I tested and PH was at 7.8. I added 68ounces of muriatic acid according to pool calculator and when I tested Wednesday morning PH was still 7.8. Do I need a stonger acid? I'm I adding too little?