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Gentrol
Pestbook

Drain flies

Drain flies breed in the film inside floor drains and overflow pipes. The foam reaches the larvae feeding in that layer.

The drain is the nursery

Adults on the wall are the visible end of a population living in the scum layer inside the drain. Swatting them changes nothing by morning.

Foam the collar

The aerosol laid into the drain collar and down the throat coats the film where larvae feed, and the regulator ends their development there.

A schedule beats a complaint

The film grows back weekly. Drains foamed on a standing schedule stay ahead of it; drains treated on sighting stay a week behind.

The moth-bodied fly on the restroom wall came out of a pipe, and the pipe is where the treatment belongs. Floor drains, mop sinks, overflow lines and the seldom-used fixture whose trap has gone dry are the usual sources, in that order.

Pair the foam with the mundane work: a stiff brush on the drain walls where hands can reach, and water run weekly through fixtures that rarely see it. The regulator does the biology, the brush does the geology.

Rather answer two questions?

The picker asks where the problem lives and hands back the formulation whose label fits that room.