Knowing just the right amount of baking soda to add to your low-alkaline pool is the deal. Half or three-quarters of the recommended amount should do the trick. If, after adding this amount and your pool alkalinity is still low, you can add more baking soda.

How do I raise the alkalinity in my pool?

A rule of thumb is 1.5 lbs. of baking soda per 10,000 gallons of water will raise alkalinity by about 10 ppm. If your pool's pH tested below 7.2, add 3-4 pounds of baking soda. If you're new to adding pool chemicals, start by adding only one-half or three-fourths of the recommended amount.

What causes alkalinity to drop in a pool?

There is a perfectly natural reason for this: evaporation and agitation of your water leads to a drop in the total alkalinity. ... and high heat levels will increase the water evaporation and degassing phenomena. For all these reasons, the total alkalinity in your swimming pool will fall continually during the season.