TERRO® Liquid Ant Killer

Model #: T100-12

114 reviews
0 5 4.5

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  • 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

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

    Most Recent Customer Reviews

    Review Rate
    Review posted on www.zarebasystems.com
    September 12, 2019
    Ants are aware of the bait being harmful By JT

    The ants in my honey house have gotten smarter. They seem to block the opening of the bait trap with grass and debris of all sorts. I even dumped some bait on the floor, but they still added things to absorb the liquid. I have used your product for many years ....this is the first time I've encountered this behavior. I thought you would like to see my experience, this has happened a few times this year....

    Response From Zareba®
    Kathryn : Consumer Relations Representative

    Thanks for sharing your experience! This is not uncommon, the ants are trying to disguise what they consider to be a foodsource from other nearby colonies. Please contact our Consumer Relations Team at 1-844-837-7644 for assistance or with any questions, we're happy to help!

    Review Rate
    Review posted on www.zarebasystems.com
    August 7, 2019
    Meh... By Will

    After five days there are a lot of dead ants...and still a lot of live ones too. The product isn't as effective as other Terro products I've used in the past, seems to be diluted in strength.

    Response From Zareba®
    Lauren : Consumer Relations Representative

    Hi Will - Thank you for sharing this feedback. This product is the same formula as our other liquid ant bait solutions. Any ants that consume the bait will typically die within 24-48 hours, however, it can take a few days or weeks to eliminate the colony as a whole. Please reach out to us at 1-844-837-7644 with any questions.

    Review Rate
    Review posted on www.zarebasystems.com
    July 21, 2019
    Original worked great, no more By Elcie

    I used this product regularly and always had great success within two days. My old bottle ran out so I bought a new one. In the past 5ge ants would swarm. It would all be eaten within hours, now the ants have no interest they are still around after two days. Now I have globules around that the ants just walk over they have no interest. Have they change the formulation? Or what is causing the difference? In the past I’ve tried other aunt bait or liquid and none of them worked. I have told so many people about this product in the past., But I no longer can do that I wish I knew what the difference was and why this new batch doesn’t work

    Response From Zareba®
    Lauren : Consumer Relations Representative

    Thank you for sharing this feedback. Rest assurred, our tried and true formula has not changed. However, what may have changes is the ant's food preference. Many ants prefer sweet based foods, but there are some ants that prefer more of a protein based diet, which is why you may find that they ignore the liquid bait. Please reach out to us at 1-844-837-7644 for more information on how to eliminate this type of ant.

    Review Rate
    Review posted on www.zarebasystems.com
    July 15, 2019
    LOVE TERRO!! By Kristen

    I had ants crawling all on my countertop in the kitchen. I went and bought Raid Ant traps from Wal-mart and sat all 4 out in the line of ants they had formed expecting to see the ants go to them, they never did. They just used them as a stepping stool or something they had to walk over to keep their line formed. Then my mom told me about Terro so I ordered it offline line, got here very fast! Quickly run in places a couple drops on the tear offs and I was so amazed to see the ants run to these drops like it was candy! They went and told all their friends and in a matter of 30 mins it went from 50 ants to 100s of ants. The next day they was all gone!!

    Review Rate
    Review posted on www.zarebasystems.com
    July 15, 2019
    Terro Is the BEST!!! By D

    I have used Terro for over 40 years. My grandfather used it! It is by far the best product I have ever tried. Ants love the stuff! A few minutes after placing the killer on a piece of cardboard, the ants are lined up all around it pushing for a place in line. The little puddle of Terro will have a solid ring of ants around it. Most of the time a couple of days and a couple of baitings will solve the problem. I highly recommend this product and go ot of my way to find and get it.

    Review Rate
    Review posted on www.zarebasystems.com
    July 2, 2019
    Excellent product By Marcia

    This ant bait works great! If I start using it early in the season the ant population doesn't get out of control. It's simple, safe & I buy extra so I can share with my friends!

    Review Rate
    Review posted on www.zarebasystems.com
    June 28, 2019
    Effective after several days of refreshing squares and liquid bait. By DT

    This product works. The process takes some effort and a few days depending on the size of the infestation. The application was outside my home at several areas the ants were entering the building. After using the supplied tear away cardboard squares, I cut out small squares from the flat section of a coated white paper plate. The smooth white flat surface of this material seemed to improve the ant feeding activity. The placement along the active ant trails is important. Daily replacement with new squares (keeping the squares small like the ones supplied) and liquid is necessary. Over a few days I noticed less and less ants. Also obserevd using just a a few seperate drops on each square seemed to provide enough space for many ants to have enough room to feed on the bait drops. The outside application was effective and greatly minimized the ants coming into my home. This extermination plan was based on not baiting inside to draw them in, but rather hit them outside where they were most active and at entry points to my home.

    Review Rate
    Review posted on www.zarebasystems.com
    June 20, 2019
    Works like a charm By Rose

    Terro ant killer is the only thing that got rid of our ant problem. Ants were covering our table and sink area every morning. They even found ways to get into our sealed sugar bowl and container. We put Terro out and with in 2 days , no more ants

    Review Rate
    Review posted on www.zarebasystems.com
    June 2, 2019
    best ant killer around!!!!!!!!!!!!!!!!!!!!!!!! By joy

    I have used terro for years. its the best thing since sliced bread. you do have to be patient. use it and wait about 4 days. if you see more then use more terro and they will eat it and take it back to their colonies and eventually all the ants will be gone. just give it a try. I did and I love it. I would never use anything else.

    Review Rate
    Review posted on www.zarebasystems.com
    May 28, 2019
    Amazing Product that gets the job done! By Kmath

    Terro is simply amazing! Won't use anything else. Thanks for such a great and easy to use product. I've introduced a few friends to your product and they are also grateful!

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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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