who has strongly opposed requiring farmers to filter runoff, has embraced Polk County’s effort and encouraged it elsewhere. In March, he promoted bioreactors and buffers at an event in Story ...

This is how things looked on the Robb Ewoldt farm in April as the bioreactor was being installed. A bioreactor is a big trench filled with wood chips that filters tile drainage wa ...

It will trickle through like Britta filter.” About 1,800 feet of piping will connect the Imperial River to the bioreactor situated off Old 41 Road. Directional drilling would be used to avoid ...