Down to Earth Calphos Rock Phosphate 50 Lb

Down to Earth Diatomite Rock 1 cu. ft. 25 lb A naturally mined mineral composed entirely of the skeletal remains of trillions of microscopic, unicellular plankton called diatoms. The porous aggregate particles wet rapidly and will absorb greater than 100% of their own weight in water, acting as a reservoir for plant available water (PAW) and nutrients. Indefinitely stable and non-compactable, Diatomite Rock permanently improves the structure, drainage and oxygen exchange of heavy soils and horticultural growing media. Particle size (5-12 mm)