Here's a product that's supposed to prevent scale from forming on your taps etc. http://www.scalewizard.co.uk/howitworks.htm The explanation seems a bit woolly to me, e.g. " The electronic disturbance of these crystals stops build up of scale by preventing them from adhering to each other.". What is "electronic disturbance", and how does it persist after the calcium ions in solution (not crystals surely) have passed beyond the magic electrical coil? Do you think this works or is it a load of bull?