2. Weigh or measure the amount of powdered nutrients for desired proportions (max. 1g/2L). Add the nutrients to a small jar half full of water, close the jar and shake vigorously for about 2 minutes*. You can also add the nutrients to the jar of water and let it sit for a while (15 minutes or longer), after that the nutrients will have partly dissolved and you won't have to shake the jar much for the nutrients to totally dissolve.