Chemical Adjustments Calculator

Ideal Range: 80-120 ppm

To calculate how much sodium bicarbonate is required to increase the total alkalinity, choose the increase you want and enter the Litres of your spa or pool.

grams of sodium bicarbonate is required.

Sodium bicarbonate (sodium bicarb, bicarb or baking soda) has a pH of 8.3 and contributes bicarbonate to total alkalinity. Because the pH of spa water is relatively close to the pH of bicarb, bicarb will have the greatest effect on TA, and a slight effect on pH.

Lowering Total Alkalinity

Ideal Range: 80-120 ppm

To calculate how much dry acid (sodium bisulphate) is required to decrease the total alkalinity, choose the reduction you want and enter the gallons of your spa or pool.

Raising pH with Soda Ash

Ideal Range: 7.2-7.6

To calculate how much soda ash (sodium carbonate) is required to increase the pH level, choose the increase you want and enter the gallons of your spa.

grams of soda ash (sodium carbonate) is required.

Soda Ash (sodium carbonate) has a pH of 13.0. Because it has a high pH, soda ash will greatly raise the pH, however, it also contributes carbonate to total alkalinity which will also be raised.