Soluble humic acid is available as either potassium humates or sodium humates (i.e. humic acid is only soluble in an alkaline base). Sodium humates are preferable for animals as sodium is an important inorganic electrolyte for animal health and good levels should be maintained at all times. We use Sodium humates and it is dried and packed to guarantee shelf life.  Once the bag is opened the product should not have any exposure to water or sunlight. The bag should be re-sealed especially if in a moist room and the bucket closed in between use.