Vermiculite Medium for Professional Use - 4 cu. ft. BagPVP Vermiculite for Professional Use 4 cu. ft. Bag PVP Vermiculite is a professional grade, natural mineral that delivers outstanding performance across horticulture, construction, and industrial applications. Permanent, clean, odorless, non toxic, sterile, and pH neutral, it will not deteriorate, turn moldy, or rot over time, making it a reliable long term addition to any growing medium, construction mix, or industrial application. In the garden and