TeraVita 1 Lb SP-90 Humic Acid 100% Soluble Powder 1 Pound Resealable Bag TeraVita SP-90 is soluble humate powder (soluble salts of humic acids) that contains a minimum of 90% humic acids by dry weight. TeraVita SP-90 is 100% soluble in water. This enables the product to be applied dry or in a liquid form. When adding the powder to liquid tanks, thoroughly pre-mix the powder with water in a separate container before adding it to the final liquid tank. Derived from oxidized lignite (Leonardite)