From its plant in Texas, which is certified as a zero waste discharge manufacturing facility, Nature’s Source^® makes a variety of Nature’s Source brand plant food formulations, and we do it sustainably. All Nature’s Source liquid plant foods are based on our patented, sustainable oilseed extract process delivering a renewable source of plant nutrition. There are also valuable uses for the by-product created during the manufacturing process. Filter sludge, which results from plant food manufacturing, is pressed to remove as much liquid phase as possible. The extracted liquid is resold as a registered 1-1-1 plant food product in the state of Texas. Material is then offered to local growers and cattlemen as livestock feed and plant food for their grazing pastures and hay fields. Nature's Source delivers semi-solid filter cake ranging 16-22% in protein, which is a vital feed supplement for livestock.