By raising your calcium you will bring the alkalininity down, but unfortunately that is going to by precipitating calcium carbonate. This is usually starts first in the pumps and they will need to be cleaned frequently. You also rish causing a "blizzard" when runaway precipitation occurs. Unfortunately the levels will crash and you will have to start over bringing them up again. In addition you are going to end up using very expensive additive to make sand. Having your alkalinity crash will also do wicked things to your pH.

Alkaliniy has a downward trend due to the fact that it is used up by bacterial activity. I would wait for it to come down on it own with the help of a couple of good sized water changes. Then start raising your calcium levels along with some extensive testing to determine your daily or weekly calcium and alkalinity demands of your system.