So many bubbles

No idea why I have so many bubbles, it’s been going on for over a week. I’ve rotated shock and chlorine every day in an effort to kill whatever is going on. We’ve used the tub like 5 times in the last 5 months - we haven’t washed our bathing suits this winter.

My alkalinity was a little low, I just added 6 tsp of baking soda, im not sure if it made a difference or if it would even matter….the tub is around 450 gallons.

I keep the temperature at 75 because I barely use it.