Thank you for your replies! I have my pool water tested by my local pool supply store. Not sure what system it is, but they put samples of my water in sealed vials, then inster the vials into a machine connected to their pc which prints out my chemical readings. The last one was yesterday and showed low chlorine (1.5 I think), some phosphates (200 I think), 52 alkalinity, 6.8 pH. The said the phosphates should go down over time with the rain and weather we're having. If the baking soda hasn't fully dissolved then it would make sense to not adjust the alkalinity or pH until it has. I did a chlorine shock last night and when I woke up this morning the particles that made up the cloudiness in the pool had sank to the bottom. It looked like clusters of shredded cotton on the bottom of my pool. I remember seeing something similar last year usually after I shocked the pool, but there was never cloudiness associated with it. If it's not undissolved baking soda, then I don't know what it is. I vacuumed and the pool just became cloudy again. Perhaps my sand filter is no longer working?
Thanks!