Pro-Treat Pan Tabs help control odor , build-up of sludge , and other accumulations in your Air Conditioner , Dehumidifier , Humidifier or Condensate Pump. Pan Tabs are formulated with ingredients proven effective in cleaning and preventing deposits in your drain pan. Easy to use , non-corrosive , non-toxic and biodegradable; they are complete soluble in water without forming any deposits in the pan or drain line.