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TERRO® Liquid Ant Killer

Model #: T100

Best used for:

Attracting and killing all common household ants including Argentine ants, ghost ants, cornfield ants, pavement ants, acrobat ants, white footed ants, little black ants, odorous house ants and other sweet eating ants. Designed for use in and around your home, this highly effective ant bait kills the ants you see, plus the thousands you don't see!

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Availability : In stock

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Product Description:

Terro Ant KillerTERRO® Ant Killer, TERRO® original ant killer, attracts and kills all common household ants.  The liquid ant killer is specifically designed – using the active ingredient Borax- to kill the worker ant in two to three days, giving the foraging ants enough time to share the bait with the rest of the unsuspecting colony. 

To use, simply apply the product directly from the bottle onto the provided cardboard squares and place near indoor areas where ants are spotted.

How Does It Work?

Bait vs Contact Killers

TERRO® Ant Killer is a bait product, so at first ants will come in large numbers, but they will soon disappear.  The product is specifically formulated to allow worker ants to consume the product and survive long enough to carry the liquid ant killer back to the nest and deliver a dose to the rest of the colony.   

Leave the product undisturbed while the ants are actively feeding on it.  Be sure to eliminate all other food sources in the area.  This will ensure that the ants aren’t tempted to eat anything but the deadly liquid ant killer.

This is the only way to get rid of both the ants you see and the thousands you don’t!  While the active ingredient in the bait will ultimately kill the worker ant, it interferes with the ant's digestive system and works just slowly enough that the worker has time to get back and share the ant bait with the rest of the colony.  This slow kill is needed to allow time for the foraging ants to make several trips to the bait and deliver enough bait to the rest of the colony.  

Directions for Use

Why Liquid over gel bait?

Tear the PLACE TERRO® HERE cardboard squares from the ant killer packaging along the perforated lines and simply apply the liquid ant killer directly from the bottle onto the square.  Small pieces of paper, cardboard, or foil also may be substituted.

Place the product where ants are seen, such as the edges of sinks, tubs, window sills, under food cabinets, along floors and baseboards and in corners.  Do not skimp on bait placements; the more bait placements, the better.

The key to effectively eliminating the ant infestation is to monitor the placements and ensure there is always a fresh supply of TERRO® Ant Killer for the ants to feast on.  Depending on the size of the ant invasion, complete control may take up to two weeks.

Resist the temptation to interfere when the ants come in droves — your patience will pay off as you watch your ant infestation dwindle then disappear.  

Since invading ants usually have outdoor nesting sites, it often helps to put the product outside, close to where ants are found entering the structure.  Ants typically follow defined trails from the nest to food or water so placing the ant killer close to these trails will improve control.

View video for tips on how to easily and effectively kill common household ants with TERRO® Liquid Ant Baits:


Product Features

  • Attracts and kills all common household ants
  • Convenient and easy-to-use
  • Place baits near ant trails or where ants are numerous
  • Use enough ant killer to ensure sufficient supply for the ants
  • What’s in the Box

  • 1 oz. bottle of ant killer
  • Nine cardboard squares for product placement
  • Specifications

  • 0.36 fl. oz. each
  • Contains sodium tetraborate decahydrate (Borax) (5.40%) and other ingredients (94.60%)
  • Reviews

    Most Recent Customer Reviews

    Product Review

    Review posted on
    September 12, 2014

    TERRO Liquid Ant Killer By Katzilla (Corona,CA)

    This stuff is like crack for ants!! They just can't seem to resist or get enough of it...until they are all gone. At first the situation seems to get worse, as they tell the whole colony about the new gold mine they've found; then like magic, *poof* all is clear again! So easy to use (I put it in the lids from margarine cartons, or other plastic lids), non-messy, and works quickly! Yay for TERRO!! ~Kat

    1 of 1 people found this review helpful.

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    Product Review

    Review posted on
    September 07, 2014

    It Works! By Silbert (San Diego,CA)

    We had a really bad ant invasion this summer and after buying some more expensive bait traps from another brand that did absolutely nothing, I went online and read review after review about how great Terro was. Boy, were they right! I ordered the liquid bait in the bottle here from the Terro site and even with the shipping, it was really affordable. It was delivered to me quickly and as soon as I got it, I put on some plastic gloves, drizzled some Terro bait into tinfoil "tents" I made, set the traps outside in secluded covered places to prevent the neighborhood cats and nighttime critters from getting into it, and I swear by the next day, nearly all of the ants were gone! I even witnessed them swarming one of the traps and knew they were taking it back to the queen. I also made some traps for indoors and set some in the bedrooms where I had seen them and also under the bathroom sink out of the way to get the little buggers that had invaded the bathroom. The next day, I only saw a very few and then after that, only one here and there and now the ants are GONE! I guess their colonies were getting too big outside and they were setting up a colony in the house and it was a nightmare, but with Terro, my ant problem is over. I still have some of the Terro liquid left over and will set another trap in the bathroom just to finish off any remaining stragglers. This is great stuff, so affordable and easy to use, I highly recommend it!

    1 of 1 people found this review helpful.

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    Q.I use the bottle liquid ant killer. When I apply the liquid drops, I've noticed they go from liquid to a sticky solid within 12-24 hours. Do I need to reapply? If so, how often should I reapply? Does it still work once it becomes solid?
    A. It is not uncommon for the liquid drops to start to dry out when exposed to air (think pancake syrup hardening on your counter tops). The bait continues to work as long as it is in liquid form, so if the liquid is hardening, you may want to freshen up with new drops as long as you continue to see ant activity. If you're concerned with the drops drying out, you may want to try the TERRO® Liquid Ant Baits, with the liquid housed in a plastic bait station. They keep the liquid from being too exposed and drying out too quickly.
    Q.What is the shelf life of TERRO Ant Killer?
    A. The ant bait does not have an expiration date, as the effectiveness of the active ingredient does not diminish over time. However, we recommend using fresh bait if you've had the same liquid bait for more than 2 years. Likeany food-based product, the bait may become less appetizing to ants after an extended shelf life
    Q.I am using the liguid bait pre-filled stations and the ants are filling them with dirt and sand...will the stations still be affective? Is this normal?
    A. Sometimes you will see ants depositing material near the bait stations. The ants could be attempting to protect or hide the bait for later use or establishing a nest closer to the bait itself. This will not interfere with the effectiveness of the bait.
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    All About


    There are more than 10,000 known species of ants living throughout the world. Like other insects, they have six legs; each with three joints. Ants have large heads with compound eyes, elbowed antennae, and powerful jaws. Ants are social insects that live in structured nest communities throughout the world. The species of ant determines whether they live underground, in mounds built at ground level, in wood structures or in plants or trees.

    More About Ants


    Why are ants always invading my kitchen, bathroom and laundry areas?

    Ants are attracted to food, water and shelter. Kitchens, bathrooms and laundry rooms provide at least two of these conditions, making it an ideal haven for ants to congregate.

    What’s the difference between liquid and gel ant baits?

    It’s a little known fact that adult worker ants cannot digest solid food (bait). Their anatomy is designed for transporting and digesting liquids only. Solid foods must be carried back to the colony for additional processing by the larvae stage. Liquid baits exploit this unique physiology by making it easy for ants to transport the liquid bait back to the rest of the colony, including the queen, larvae and other workers.

    I just placed TERRO Ant Killer in my kitchen and it’s attracting more ants, not killing them! What’s going on?

    You have nothing to worry about! Initially, you will see more ants. As ant foragers look for food, they are attracted to the sweet liquid in the bait which they consume and carry back to feed to the rest of the colony. On the way back to the nest, the ants drop what it called a ‘trail pheromone’, letting the other ants know where the tasty food supply is. In turn, these ants follow the trail to the bait which explains why you initially see more ants.

    The active ingredient in the bait interferes with the ants' digestive systems, eventually killing the ants within 24-48 hours after consumption. This slow kill gives the worker ants enough to get back and share the bait with the colony. Baiting is the only way to successfully wipe out the ants you see and the thousands you don’t.