This method uses table salt which will prevent colors from fading.
In a large pot over medium heat warm the water
Add the baking soda and salt, mix until dissolved.
Add the castile soap and mix well.
Pour mixture into an old container or milk jug that has a lid.
Add water until the jug is full, shake well.
Use 1/2 cup per load. If you have a HE washer use 1/4 cup per load.
Shake well before use.
This method yields 40 loads