In irrigation studies conducted a few years ago, we noticed that when irrigating with water that had been stored in a pond for several days prior to irrigation, furrows treated with PAM to reduce erosion, rapidly (1 - 2 hrs) accumulated algae tufts at the bottom of the furrows, whereas untreated furrows did not. This observation led us to speculate that PAM might be used to intentionally sequester microorganisms from water flowing down furrows.