Indiana banned phosphorus-based detergents twenty-five years ago. Home dishwashers were rare then, so they were excluded. Dishwasher detergents sold in Indiana still contain up to eight percent phosphorus which, along with nitrogen, remains a major cause of algae in lakes and streams. Now the state legislature wants to close that loophole with a ban on the sale of phosphorus-based dishwasher soap after July 1, 2010. Thomas Easterly, commissioner of the Indiana Department of Environmental Management, says soap manufacturers will have an enzyme-based product available by the deadline that will clean dishes well. Commercial dishwashers, such as those used in restaurants,...