Transfer the finished mixture to an enclosed container to store.
Use 2-4 tbsp per load.
Notes
A gallon size containerworks well to store this powder laundry detergent.
Mix all the ingredients together very thoroughly before transferring to your storage container so that each load of laundry gets a little of each ingredient.
This recipe makes approximately 16 cups of powder laundry detergent. If you use ¼ C (4 tbsp) per load of laundry, this should last you 64 loads. If you use 2 tbsp per load, this should last you 128 loads.
You can easily half or double this recipe, depending on how much you want to make at one time and how big your storage container is.
I recommend using at least warm water with each load so that the grated castile soap can easily melt and wash away.
Most instructions for powder laundry detergent recommend either 1 or 2 tablespoons per load, depending on the product or recipe. Even though my DIY recipe works really well, I usually use 3-4 tablespoons per load.