I have been allowing my pool maintenance company to manage my pool chemicals and until recently everything has been great. They hired a new person to clean my pool and things rapidly deteriorated with significant algae. We now have that under control however now my Alkalinity is significantly low at only 21 ppm. pH has been a little high bouncing between 7.6 and 7.8. I know I need to get the alkalinity up but my fear is that to raise it that much that I will be throwing the pH way out of whack. Any suggestions for controlling the increase without getting into a major chemical battle?