Use approximately 40 grams per wash. Tip: an old protein powder scoop works perfectly for this, weigh it once and you'll always know exactly how much you need. For hard water or a heavily soiled load, add an extra half scoop. Wash at 40 or 60 degrees. An eco program works too, just make sure to let it run the full cycle and avoid the quick wash. Great for all your colored and dark laundry, not for wool and silk. Never combine with chlorine bleach. Store the container completely dry and tightly sealed.