Method for purifying water

A method for purification of water with a water purifier, wherein the water purifier comprises an anode and a cathode as electrodes in such a way that

• the anode and the cathode define a longitudinal direction,
• a gap remains between the anode and the cathode,
• the anode comprises a first anode material and a second anode material, the first anode material being aluminum and said second anode material being iron,
• the first anode material and the second anode material are arranged in the anode subsequently in the longitudinal direction or electrical insulation remains between the first anode material and the second anode material in the longitudinal direction,
• in the anode, aluminium is arranged in the flow direction of water for purification on the downstream side relative to iron,
• in which method the longitudinal direction forms an angle of a maximum of 30 degrees with an upward vertical direction,
• water for purification is conveyed to the gap, whereat water for purification flows in the gap beside both the first and the second anode material in said longitudinal direction from a bottom of the water purifier to a top of the water purifier,
• a secondary voltage is applied to the cathode,
• a first primary voltage is applied to the first anode material, and
• a second primary voltage, which is unequal to the first primary voltage, is applied to the second anode material, and
• which first and second primary voltages are higher than the secondary voltage, and
• an additive enhancing floc formation is introduced to water in an amount of at least 1 g and less than 50 g, measured as dry matter, per each cubic metre of water for purification.