Systems like Imperial Maximum, Imperial Plus and Columbia II Plus do not remove good metallic salts and trace elements from water which remain and need to be in it. Aqua Vie and Columbia D initially removes them, because purification is done by distillation, however after that, as the water passes through metallic salt cartridges, they acquire the necessary metallic salts from them which the human body needs. Their acquisition is done in a similar way as when the water, passing through the rocks of the earth, acquires metallic salts.
