As Nutrient Additive:
Add to nutrient solution at the rate of 1 teaspoon per gallon (1.25 ml per liter) Renew with each nutrient change.
As a Foliar Spray:
Add 1 – 2 teaspoons per gallon of water (1.25-2.5 ml per litre). Spray foliage lightly, particularly the bottoms of leaves. Use weekly in addition to your regular fertilizer.