How to Raise Swimming Pool Alkalinity With Sodium Bicarbonate. Having the right level of alkalinity in a pool is critical. Rather than raise the level of alkalinity by adding harmful chemicals, try using sodium bicarbonate.
Add sodium bicarbonate to your pool to raise the alkalinity of your swimming pool. Dump a predetermined amount into the pool's deep end. For example, if you wish to raise the alkalinity to 10 ppm, add 1 ½ pounds of sodium bicarbonate if you have 10,000 gallons of water in your pool. The amount of bicarbonate you add depends on the amount of water you have in your pool as well as how much you wish to raise the alkalinity. Use the calculator found at Backyard City Pools.
Make sure you add sodium bicarbonate to your pool without adding other chemicals at the same time.
Remember to add only 2.20 pounds of sodium bicarbonate per every 11,000 gallons every four days. Depending on by how much you wish to raise the alkalinity, this process could take a while.
Test the pool water to keep track of the changes in alkalinity so you don't add too much or too little.