Backers of legislation approved this past week in the Ohio Statehouse said it's impossible to predict what the end result will be from banning farmers in northwestern Ohio from spreading manure on frozen and rain-soaked fields and bringing an end to the dumping of dredged sediment in the lake within five years. The changes — the first made by the legislature since a toxin contaminated the drinking water for more than 400,000 people in northwestern Ohio and southeastern Michigan last August — also include more testing of farm field runoff and at wastewater plants along with a new state coordinator to oversee monitoring, treating and testing of algae. "[...] it's a multifaceted problem," said Ohio Senate President Keith Faber. Adam Rissien, the Ohio Environmental Council's director of agricultural and water policy, said the state only addressed when manure should be applied to the fields and didn't include chemical fertilizers that also include phosphorus.