RAISING TOTAL ALKALINITY
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.

Desired increase in total alkalinity: 10 ppm 20 ppm 30 ppm 40 ppm 50 ppm 60 ppm 70 ppm 80 ppm 90 ppm 100 ppm
Litres of water:

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 relitivly 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.

Desired reduction in total alkalinity 10 ppm 20 ppm 30 ppm 40 ppm 50 ppm 60 ppm 70 ppm 80 ppm 90 ppm 100 ppm
Litres of water

grams of dry acid (sodium bisulphate) is required.

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.

Desired increase in pH 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Litres of water

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.