Coconuts often grow in areas where the subsoil is high in salts. Think of the postcards with palm trees on golden beaches. This means that Cocos nucifera can easily absorb chemical elements such as potassium, sodium and chloride without being negatively affected (contrary to most plants cultivated in the horticultural sector).
These salts are present in the whole plant and it is therefore a minimum requirement to wash the part of the plant we use, in our case the husk, to bring the E.C. level down to an acceptable level. If we didn’t do this, the grower would have to wash the cocopeat, because apart from sodium and chloride there would be too much potassium present. Potassium is an antagonist for calcium and magnesium.