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Treats sewer chambers, drain lines and stair ducts where cockroaches breed for the whole building.
Manholes, inspection chambers, garbage rooms, drain stacks and utility ducts are sprayed and fogged with residual insecticide to cut the source that keeps re-infesting flats.
Best booked by the building committee alongside flat treatments. Residents are informed to keep drains closed for a few hours. Repeat every 3 months for lasting results.