Houseflies are a sanitation pest - they breed in decaying matter and follow food indoors. Cutting the source does more than any swatter.
Flies breed in decaying organic matter, so the source is usually trash, pet waste, compost, or a forgotten spill. Find and clean it and you cut the breeding cycle, which is what a swatter or trap never does. Keep trash sealed and taken out, and clean up pet waste promptly.
Then close the entry. Repair torn screens, seal gaps around doors and windows, and use screens on frequently open doors. For persistent indoor populations, treating the surfaces where flies rest, combined with the sanitation work, brings the numbers down for good.
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A breeding source nearby - trash, pet waste, or a dead animal in a wall or attic - usually explains a sudden bloom.
They help, but they do not address the breeding source, which is where lasting control comes from.
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