JBL Ferropol is specially balanced to provide aquatic plants with all the essential nutrients. * For the absorption of nutrients through the leaves. * Contains iron, potassium and other essential minerals and trace elements in a form readily-accessible for plants. * Does not contain phosphates and nitrates. * Remedies chlorosis and potassium deficiency. * Add 5 ml / 20 litres, either weekly or after fertilizer check (JBL Fe Test set).