Okay, crap!

Sounds like I made ANOTHER mistake! This morning, the ph is about the same, 6.8 or so, but my total alkalinity is about 300 ppm! Sounds like baking soda was the WRONG thing to add.
The pool has a waterfall. Will this sub for the airation?

I also have 2 boxes of borax (what I SHOULD have put in, instead of the baking soda). Should I add that?