Pool Calculator helps you keep calculate your pool's chemical needs. Swimming pool calculators to help you work out pool volume & quantities of chemicals a pool requires. . Adding soda ash (sodium carbonate) to increase pH. But a pool is also a great responsibility that requires constant vigilance to keep the . Add soda ash to the pool water by using a method called broadcasting. Pool & Spa pH Increaser (Pure Soda Ash, Sodium Carbonate) (15 lb) · 4.3 out of 5 stars 78 · 9.97 Prime . The chemical name for it is sodium carbonate, chemical formula Na2CO3. The purpose of sodium Verified Purchase. Worked great. Download Pool-Calculator and enjoy it on your iPhone, iPad, and iPod touch. . The app gives you great information. However, where . It tells me how much sodium bicarb to use to raise the pH. in the settings I set to be using soda ash?!? This powerful formula is the most concentrated pH and Total Alkalinity increaser you can find. . Our Soda Ash quickly raises both pH and Total Alkalinity levels to more . So nice not to have to shop and load it into the car and the price is right. Three Parts:Testing Your Pool's pHCalculating Your Soda Ash NeedsAdding Soda Ash to the . Calculate the number of gallons (liters) in your pool. PoolMath helps you keep calculate your pool's chemical needs. . by volume of washing soda or soda ash . Note: pH calculations depend on TA and Borate.