Use Shoo Fly II whenever you are experiencing a problem with drain (fruit) flies. If your sink/drain has continuous problems with drain flies you may use it daily as a preventative. Use Shoo Fly II on all floor drain pipe walls after the nightly cleaning has been done and no more water will be flushed down the drain. Shoo Fly II will eliminate most obnoxious odors associated with decay which results where food waste accumulate in the top 2” of drain flange. Excellent for use in drains for food handling operations to destroy food waste accumulations on pipe walls which can be breeding areas (nesting places) for flies and other insects. Where drain flies cannot breed, they do not inhabit the area.