Advanced Nutrient System. General Hydroponics FloraMicro Hardwater (5-0-1) is specially formulated for hard water conditions. Required for use if your tap water is over 200 ppm (or contains calcium above 70 ppm). Just like General Hydroponics regular Micro, it provides rapidly growing plants with nitrogen, potassium and calcium, a combination of chelated micronutrients and trace elements. Combine with FloraGro and FloraBloom to meet the specialized needs of each phase in a plant’s life cycle: seedling, vegetative, transitional, flowering and fruiting.