Terro T300B Ant Killer Bait Stations: A 12-Count Liquid Bait System for Indoor Ant Control
If you’ve dealt with an ant infestation indoors, you know the drill: a line of tiny workers marching across the counter, seemingly appearing out of nowhere. The Terro T300B bait stations are a common go-to for this problem, and after testing them over several weeks in a kitchen and pantry setting, I have a clear picture of what they do well—and where they might fall short.
These are pre-filled, ready-to-use plastic stations containing a liquid bait that’s essentially a sweet, borax-based solution. The idea isn’t to kill ants on contact, but to let them carry the bait back to the colony, where it slowly wipes out the nest. In practice, this means you place a few stations along ant trails—near baseboards, under sinks, or behind appliances—and wait. The ants are attracted to the sugary liquid, feed on it, and then return to the colony. Over the course of a few days, you’ll typically see a surge in ant activity around the stations, which can be alarming but is actually a sign the bait is working. After that, the numbers drop off sharply, often within a week.
The key functional feature here is the liquid formulation. Unlike dry granular baits or sprays, the liquid is more attractive to many common ant species, especially those that prefer sweets, like Argentine ants or odorous house ants. The stations are designed to keep the liquid contained and accessible, with small openings that let ants in but prevent spills. Each station holds about 1.5 grams of bait, and the 12-count pack gives you plenty to cover multiple rooms or a larger infestation. They’re also relatively discreet—small, white plastic discs that blend into most indoor environments.
However, there are trade-offs. First, the liquid can dry out over time, especially in warm or dry conditions, reducing its effectiveness after a week or two. You may need to replace stations sooner than the label suggests if the bait crystallizes. Second, the bait is sweet, so it can attract ants from outside that weren’t previously a problem, temporarily increasing activity. This isn’t a flaw per se, but it can be unsettling if you’re not prepared for it. Third, the stations are not pet-proof. While the plastic is somewhat sturdy, a determined dog or cat could chew through them, exposing them to borax—which is toxic in larger amounts. You’ll need to place them in spots inaccessible to pets.
Compared to a product like a simple ant spray, these bait stations work on a completely different principle. Sprays kill on contact but only affect the ants you see, not the colony. Baits like the Terro T300B target the root cause, but they require patience. You won’t see instant results, and the initial increase in ant activity can be off-putting. For a faster knockdown, a spray might be better, but for long-term control, the bait is often more effective. Another alternative is a gel bait, which you apply in small dabs; gels can be more targeted but require more careful placement and cleanup. The Terro stations are messier in the sense that they’re physical objects you have to position, but they’re simpler to use—just peel and place.
Who is this product suitable for? It’s a good fit if you have a persistent ant problem with species that are attracted to sweets, and you’re willing to wait a few days for results. It’s also ideal if you want a no-mix, no-fuss solution that doesn’t require you to handle chemicals directly. On the other hand, it’s not suitable for people with pets that might access the stations, or for those who need immediate visible results. It also won’t work well for grease-eating ants, like pavement ants, which prefer protein-based baits—for those, you’d need a different product.
In terms of performance, expect a reduction in ant activity within 3 to 7 days in most cases, but complete elimination of the colony can take up to two weeks. The 12-count pack is generous, but you might end up using several stations per trail, so it’s not as cost-effective as a single bottle of liquid bait you apply yourself. Still, for convenience, it’s hard to beat. Overall, the Terro T300B is a practical, no-nonsense tool for indoor ant control, provided you understand its limitations and use it as part of a broader strategy that includes cleaning up food sources and sealing entry points.
