Minimum 2.5litres of distilled or de-mineralised water
Bi-Carb soda or Baking Soda 2.4gm
Measuring Jug with minimum 500ml capacity
Accurate scales or measuring spoon (½ tspn = approx. 2.5gm)
Minimum 2ltr storage bottle
Minimum 600ml storage bottle
You can adjust your solution up by adding tiny amounts of 40dkh solution or down by adding small amounts of de-mineralised water.
Test after each “add” as the dkh measure can move quickly.
This method is not 100% accurate although it is good enough method to make a solution for using in CO2 Indicator bulbs.