Easy-Life Potassium is an essential  macronutrient and is at least as important as iron!

A shortage of potassium easily arises in areas with soft water. 
This demonstrates itself by white, decolourized leaves in the top of a plant. The leaves may also have black pinholes. 
These symptoms are often confused with the symptoms of a deficiency of iron. It is recommended to add both Easy-Life Ferro and 
Easy-Life Potassium to compensate for or prevent deficiencies, particularly in aquaria with fast-growing plants.