Our finest humates, produced from 75 million year old freshwater lake deposits, the 400 mesh gallons consist of the smallest microns of dry humates available (from 400 to 1000 mesh). Intended for immediate uptake from plants and produces extremely fast results. Beneficial after spring tillage, pre-planting with seed and after first blossom. Recommended use – 5 to 20 lbs. per 1000 square foot. (225 to 900 lbs).