Dialysis treatment clinics have long been plagued by the accumulation of biofilm in drains and floor sinks. This organic material is unsightly and emits strong and unpleasant odors. It also acts as a breeding site for various small-fly species. The "symptoms" of biofilm accumulation -- odors, visible slime in floor sinks, and small-fly infestations -- denote "unsanitary conditions" and alarm both patients and staff. Dialysis clinics have historically poured bleach and hot water down their drains to remove biofilm -- neither works.