I had planned on buying the
potassium Nitrate (5-20 ppm lower if I have red or colored plants, about 1000-2000 g in 500ml of water)
potassium sulfate (15 ppm, 3150 g in 500 ml of water)
mono potassium phosphate (0.5-1.5 ppm, 72-144 g in 500 ml of water)
and Plantex csm+b for trace minerals...