Dennerle Plant Care NPK is a macronutrient fertilizer for demanding plant aquariums. They contain three macronutrient elements N = nitrogen (nitrate), P = phosphorus (phosphate) and K = potassium, which are of particular importance for plant development. The nutrient ratios in Plant Care NPK are selected so that all three macronutrients are absorbed by plants in equal proportions. This means that even with long-term, regular use, there can be no deficiencies or harmful accumulation of individual nutrients. Dosage, as needed: 10 ml. per 100 l of aquarium water.