Basalt Microfines is the BEST paramagnetic rock dust for remineralization in a stone flour gradation. Works in fruit and vegetables, turf, forestry, greenhouse and for remineralizing compost. This rock dust may be incorporated directly into growing media or suspended in liquid for fertigation, drenches, watering house plants etc. May be incorporated into potting soils up to 5% by volume. Will not burn plants. Suggested application rates: Between 5-25 lbs/ 100 sq. ft in tillage or incorporation or spread on the surface. Top feed the soil and water in. Please use caution when handling this powder to avoid respiratory inhalation. Instructions are in the box