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FloraDuo B 726890 General Hydroponics Flora Duo B 2.5 Gallon. FloraDuo is a revolutionary new fertilizer product. Using only two components growers can mix a large range of different nutrient blends for different kinds of plants and for phases of growth from seedling through harvest. The ratios of key ingredients including Nitrogen, Phosphorus, Potassium, Calcium, Magnesium, Sulfate and micronutrients all change with different blends; each tailored to meet specialized plant needs. FloraDuo B 726890 General Hydroponics Flora Duo B 2.5 Gallon