It's so easy! Use 1 Tbsp. per load. This recipe makes 48 loads.
1 cup Borax
1 cup Washing Soda
1/2 cup Citric Acid
1/2 cupe Kosher Salt
Combine and store in a covered container (Mason jar works well). If you have super hard water, you may want to add some apple cider vinegar to your rinse cycle.