Yes, but measure first.

Baking soda (sodium bicarbonate) is exactly what you use to raise total alkalinity in a pool. Just don’t guess — add too much and you’ll fight pH swings for weeks.

For a typical 10,000-gallon pool, 1.5 pounds of baking soda will raise alkalinity by about 10 ppm. Most pools want alkalinity between 80–120 ppm. So test your water, figure the difference, and do the math from there.

Pour it slowly into the deep end with the pump running. Wait at least 6 hours before retesting. It’ll also bump pH a tiny bit, but not enough to worry about unless your starting pH is already high.

This is not the place to eyeball it.