new to pool chemistry

[mohawk]

Hi all- We have a new 20,000 gal ab pool. We love it. Now my problem is the ph is at 7.8 and the alk is 220. The pool store sent along certain chemicals with the pool purchase and I tried using them to lower the numbers but nothing has budged. I read the sticky on lowering the alk-using some kind of jet to disturb the water, but I'm just not quite understanding that process. Any help would really be appreciated. What I used was 2 3# containers of sodium bisulfate. Denise