How much baking soda do you use in a 2888 gallon swimming pool?

you have to use alkalinity up. not soda ash.

Baking Soda and Soda Ash are not the same thing. If in fact your alkalinity is below 80 ppm the addition of small amounts ( unless you are well below 50 ppm) of baking soda premixed in a pail and then added to the pool. Brush the pool if needed and in about 20 min. test again, continuing until you reach somewhere around 60 ppm. Test the next day for any change and adjust accordingly. This should have little effect on you pH. If the pH changes drastically adjust according.

k