Soda Ash Vs Baking Soda For Pools When To Use Whichpop ash is a great additive for pools. It is a key ingredient in preserving the sanitation and harmony of the water. Soft drink is specially formulated to help decrease acidity and stabilize the pH levels in your pool. By utilizing soda ash for pools, you can make certain ideal water conditions for bathing and upgraded safety for everyone in your swimming pool.