The problem of hardwater scale is often addressed with salt-based water softeners that remove scale-forming calcium and magnesium ions and replace them with sodium ions. This ion-exchange technology, while the current norm in much of the United States, is not the only way to prevent hard-water scale. Salt-free options, more common in Europe, are readily available, comparable in cost, and effective. Environmental Engineering students from Purdue University will share the results of their lab analyses of two EMF anti-scale devices.