Floc is a real work, even if your spell-checker flags it. In fact, it's a scientific word that describes those little particles of fluff that float in aquatic systems. These little specs floating in the water column have a sinister secret, they harbor antibiotic resistance. Drudge et. al from McMaster University tested four different sites, Hamilton Harbour, impacted by sewer overflow; Sunnyside Beach in Toronto, impacted by wastewater; a rural stream by light agricultural activities; and a remote lake in a natural preserve area in Algonquin Park looking for 54 different known antibiotic resistance genes. As one would expect, the more pollution in the water system, the more antibiotic resistance genes were found. This is yet another reason to keep aquatic environments clean.