A new technology being promoted by Green Mountain Power and the University of Vermont might clean up manure before it's spread on farm fields, reducing the chances for air and water pollution. The technology, being sold by a Colchester businessman, uses electricity to kill disease-causing bacteria in liquid manure. That nearly eliminates the odor from the manure by removing 20 percent or more of its phosphorous. Nonetheless, experts said, the manure retains what's needed for farmers to use it as fertilizer. "I always start by telling people this is not a silver bullet. It will not eliminate water pollution from farm runoff, but it's one more layer of technology to address the problem," said Buzz Hoerr of Colchester, president of ElectroCell Technologies.