A single rat falls for a trap. A colony established in a party wall or sewer network learns to avoid it within days — the brown rat, the most common urban species in Belgium, is among the fastest mammals at associating danger with an object.
Mechanical traps: effective on one individual, not on a population
Classic snap traps, electronic traps or cage traps: all work on a naive rat with no prior experience of traps. Capture rate drops sharply once one or two rats have been seen or smelled caught — rats then avoid the area for weeks (neophobia).
Placement determines most of the outcome: a trap set in the middle of a room stays empty, rats move along walls and obstacles. Effectiveness depends on precisely mapping travel routes, which an untrained inspection often misses.
An electronic trap kills more cleanly and avoids handling a still-living animal, but doesn't fix the root problem: without treating the entry point, a new rat takes the previous one's place within days.
Rodenticide (poison): fast on paper, risky in practice
Over-the-counter anticoagulants kill days after repeated ingestion — that delay lets a poisoned rat die anywhere inside the building's structure (wall, false ceiling, insulation), with the decomposition smell that follows.
A poorly placed bait is accessible to children, pets or non-target species: Belgian regulation strictly controls rodenticide biocide use outside a professional framework for that reason.
Resistance to first-generation anticoagulants is documented in some urban Belgian populations, which makes a simple over-the-counter rodenticide pass insufficient on an established infestation.
Without secured bait stations and a follow-up plan, poison reduces a population without ever eliminating it — survivors breed and the infestation returns within weeks.
Ultrasonic repellents: a real effect, but temporary and localised
Ultrasonic devices disrupt rodent hearing and can drive them out of a room in the first days of use — the effect is real, not marketing myth.
Habituation is the documented problem: after a few weeks, some rats stop reacting to the signal. The wave passes through neither walls nor furniture, so protection stops at the device's line of sight.
An ultrasonic repellent slows down a passing rat; it will never dislodge a colony established in a wall cavity or a cellar.
Why these methods fall short on an established infestation
A female brown rat can produce several litters a year. A method that reduces the visible population without treating the entry point and the nest gives reproduction time to offset losses.
The brown rat is an excellent climber and swimmer, able to fit through an opening the size of a 2€ coin. Sealing visible access points without locating every real entry point isn't enough.
A professional diagnosis maps travel routes, entry points and nesting areas before setting a secured bait station and sealing plan, with follow-up tracking.
When to switch to professional rodent control
If rats remain visible during the day (a sign of a large population), if signs (droppings, gnaw marks, noises in walls) persist after several weeks of traps or poison, or in case of a decomposition smell with no visible carcass.
Antinox installs secured bait stations, identifies and treats entry points, and follows up until eradication is confirmed.
Frequently asked questions
Is an electronic rat trap more effective than a classic one?
It kills faster and more cleanly, but suffers from the same placement and neophobia issues as a mechanical trap. Neither addresses an established population.
Is over-the-counter rodenticide dangerous for pets?
Yes if the bait isn't placed in a secured, inaccessible station. That's one reason professional, controlled use is recommended beyond a single stray rat.
Is an ultrasonic repellent enough against rats?
It can drive off a passing rat in the first days, but habituation reduces its effect over time and it doesn't pass through walls or furniture. Ineffective alone against an established colony.