Potassium sulfate (K2SO4) is a source of Potassium (K) necessary for protein synthesis and Iron (Fe) metabolization. Sulfur (S) is essential for root development.€‹ Potassium is one of the most important nutrients for aquarium plants. It is the member of the NPK group (Nitrogen, Potassium, Phosphorus) which are the most important nutrients for aquatic plants. Plants need them in a huge amount regularly. So, often a shortage of potassium occurs in the aquarium. That's when additional potassium has to be supplemented.
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