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TERRO® Liquid Ant Killer

Model #: T100

Best used for:

  • Attracts & kills all common household ants
  • Attracts ants fast
  • Kills the ants you see and the ants you don’t
  • Buy More, Save More - discounted price per each

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Product Description:

Terro Ant KillerTERRO® Ant Killer attracts and kills all common household ants. The liquid ant killer is specifically designed – using the active ingredient Borax – to allow worker ants to consume the product and survive long enough to carry the liquid back to the nest and deliver a dose to the rest of the colony. Complete control may take up to two weeks. 

To use our best ant killer, 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?

TERRO® Ant Killer is a bait product, so at first ants will come in large numbers, but they will soon disappear. This liquid ant killer 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. Baiting enables you to get rid of both the ants you see and the ants you don't.   

Leave our at-home ant killer 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 – indoors and out.

While the active ingredient in our indoor ant killer 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 home 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 may also be substituted.

Place this household ant killer 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 and then disappear.  

Since invading ants usually have outdoor nesting sites, it often helps to put our best ant killer outside the home, 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

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

    Disclaimer: does not endorse any information contained in product reviews. Please follow all label instructions for your specific use.

    TERRO® Liquid Ant Killer is rated 4.9451 out of 5 by 91.
    Rated 5 out of 5 by from Really works long term I have used the product for two years and for getting rid of ants it sure beats sprays and other treatments. Follow the instructions and I would not suggest using indoors.
    Date published: 2016-06-16
    Rated 5 out of 5 by from A super result from Terro Ant Killer! My ant killer and traps arrived about 10 days ago, and I excitedly put the traps down where I thought the ants were coming into my home. Just as noted on the website, ants all gathered around the Terro Borax liquid on the traps. Some just died there, but a few must have staggered back to the nest, because within 2-3 days I just stopped seeing any more ants! Thanks, Terro!
    Date published: 2016-06-08
    Rated 5 out of 5 by from I love it I have 2 rentals property's that seem to get ants every year. I give them the nice orange box and tell them how to use it. My tenants like it also. If they need more they pick up TERRO in the orange box.
    Date published: 2016-05-26
    Rated 5 out of 5 by from Best On The Market When all other ant killing treatments failed I turned to Terro to get the job done. Hours after I had placed the liquid drops down, the ants came a running to drink that tasty death elixir. Within a week the amount of ants we had seen greatly decreased. And now we no longer see any of them. Thanks a ton!
    Date published: 2016-04-27
    Rated 5 out of 5 by from Years of Relief!! I have been living in the same home in the mid-atlantic portion of the country I the same home now for a little over 28 years. Every spring I have been plagued by ants getting into my home. About 15 years ago I tried using Terro liquid ant killer at the advice of my Mother, and I have been able to control the annual infestation ever since. I highly recommend this product to anyone who has a similar problem.
    Date published: 2016-04-25
    Rated 5 out of 5 by from Tried and True!! This product is incredible!! Use as directed, and be prepared to stand back and watch the ants swarm! It takes restraint to just leave them to their "feast," but each day you will see fewer and fewer at "the party"! I used this, plus ant baits last spring, and ants were gone in 3 days. This spring, I put it down again, as directed, when I saw the first ant. As they did last year, more swarmed, but not anywhere near as many. Within 3 days, they are all GONE!! I will continue this routine for about a week, just to get any stragglers. This works like nothing else I've tried. I am going to stock up in fear of them changing the formula.
    Date published: 2016-04-25
    Rated 5 out of 5 by from Ants beware! Wonderful! Works exactly as advertised. It took about 10 days for the ants to be completely gone, but, the stuff worked!
    Date published: 2016-04-21
    Rated 5 out of 5 by from Good product. Liquid Ant Killer is a good product as it contains Borax which is not a poison and works by drying up the ants that infest my home. Each year they arrive and are a problem. I possibly think spiders eat the ants, as I have noticed no spiders since using the Borax drops. The ants are attracted to the bait stations placed away from getting further into my home and this keeps them from taking over the entire house. I definitely recommend Terro Liquid Ant Killer.
    Date published: 2016-04-16
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    I am using this product to control ants. I also have a carpet beetle larva problem. Is it effective against carpet beetle larva?

    Asked by: ChrisT
    No. We would not recommend this product for carpet beetle larvae.
    Answered by: Consumer Relations
    Date published: 2016-03-21

    WHAT are the "other ingredients"?

    Asked by: Margie
    The other ingredients in the TERRO® Liquid Ant Baits are sugar and water.
    Answered by: Consumer Relations
    Date published: 2016-05-11

    Attracted carpenter ants inside house well at first. 1week later they don't seem interested. Numbers seem reduced, but wonder if I missed something 

    Asked by: Joeinseattle
    We do apologize that we do not recommend this product for carpenter ants as they will not be attracted consistently. At different points in their life cycle, they may feed on sweet food sources. Other times, they will have more of a protein-based diet.
    Answered by: Consumer Relations
    Date published: 2016-05-27

    Will my cats be attracted to the poison? Can it kill them out gtsm them?

    Asked by: Katie343434
    We recommend placing this bait in areas where pets are not able to access.
    Answered by: Consumer Relations
    Date published: 2016-05-11

    Is Terro ant killer  poisonous to humans

    Asked by: warren
    The active ingredient is borax and it has a very low toxicity. Please contact our Consumer Relations Team at 800-800-1819 ext. 458 with additional concerns.
    Answered by: Consumer Relations
    Date published: 2016-05-11

    How should I dispose of the used cardboard with supposedly the dead ants?

    Asked by: Maggie Mae
    Used cardboard square can be disposed of in the trash once the bait has been eaten by the ants.
    Answered by: Consumer Relations
    Date published: 2016-02-18

    Have a black ant problem with an occasional black carpenter ant showing up. Will the regular ant killer take care of both or do I need to get something else for the carpenter ants? Thanks

    Asked by: Ronald
    This product is recommended for ants that are attracted to sweet food. Due to the fact that sweets are not the primary diet of carpenter ants, we recommend our TERRO® Carpenter Ant & Termite when battling these pests. Several other products can also be used. Please feel free to contact us directly at 800-800-1819 x 458 for assistance in determining the best fit for your needs.
    Answered by: Consumer Relations
    Date published: 2016-02-12

    Not able to see any sort of trail, tiny ants on counter possibly come thru electric outlet openings. Put the bait liquid on the pieces of cardboard from box, but these ants seem to ignore it, go to edge of cardboard then leave it rather than go get it.

    Asked by: TWM53
    If the ants are not attracted to the sweet bait, we recommend a contact killer such as our TERRO® Ant Killer Spray.
    Answered by: Consumer Relations
    Date published: 2016-01-26
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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.

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