7800 gal above ground oval pool, vinyl liner. Just had the liner replaced, filled the pool and can't get the pH to budge off of 7.2. have added 4# of Borax three times per the pool calculator and no effect. Everything else is in range CH = 230, alk = 100, cya = 70 a little high. Using liquid bleach to shock and dichlor granules for daily chlorine add. Any ideas?