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

    TERRO® Liquid Ant Killer is rated 4.941747572815534 out of 5 by 103.
    Rated 5 out of 5 by from Ant-free! I purchased this to rid my home of ants. Within days the numbers dwindled to almost nonexistent. I'm sure that in a few weeks, my home will be ant-free!
    Date published: 2016-10-17
    Rated 5 out of 5 by from Great product! I bought this because I had ants in my car!! I don't know how they got in there, but I put a dime size amount of ant killer in the front floorboard, the back seat floorboard and in the back of my SUV. After just a couple of hours, ants were swarming all over the traps! I didn't even think there could have been that many in my car! I was tempted to spray them with another ant killer, but after reading other reviews, I resisted, and let them eat. I left the liquid in there overnight, and the next day they were gone! I left the liquid in for a couple more days to make sure they were all dead, but I haven't seen the first ant. I am very happy with Terro liquid ant killer!
    Date published: 2016-09-15
    Rated 5 out of 5 by from easy to use Well, the ants LOVE this stuff. They literally line up to eat it. It's easy to see it being used by them and easy to use. The solution is thick and doesn't run. A little goes a long way. Thanks Terro!
    Date published: 2016-09-02
    Rated 5 out of 5 by from Carpenter ants I had a large nest of carpenter ants in my tree. I could not believe the activity of ants moving up in down the tree at night. There were hundreds of them. I bought some of the liquid gel and made a continuous line around the trunk so they would have to walk through it. Within a minute all the ants were consuming the terro gel. Next day. Not a single ant. I was shocked at how well this stuff works.
    Date published: 2016-08-25
    Rated 5 out of 5 by from fantastic I put this out at the first sign of ants inside my house this spring. It took 4 days to be ride of the ants for the spring and summer. I will for sure use it again next spring if I have to. I would say use this. The price is right and the results are GREAT !
    Date published: 2016-08-08
    Rated 5 out of 5 by from Great Product at Excellent Price I had 4 large outdoor colonies. Infestation of two trees and two good colonies going underneath my house. I purchased for $3 a pack of 4 liquid bait containers. Checked on bait spots in a couple of days making sure all was well. Needed to replace baits 3 times (the 3rd time I poured it onto our lava rocks). Within 3-4 weeks both colonies going under the house were gone. Still some occasional (slower) ants at trees so just left more out there to finish those off and to prevent new colonies from starting. I'm totally impressed. Wish I would have used this years ago. Fifty six year old mountain woman.
    Date published: 2016-08-05
    Rated 5 out of 5 by from Revenge on the Black Ants I bought liquid any bait and very happy I did. I had black ants crawling all over my new trex board deck. I had previously tried other brand ant granules and they did nothing. In fact I watched the ants actually walk away from other baits. However the liquid bait from Terro they swarmed to. I strategically placed drops between the spaces of the deck and fasteners so ants could easily access but not humans. I baited for 3 weeks and reapplied after rain. This stuff works. I wasted a ton of money on other products. Ants are now gone with Terro Liquid Ant Bait.
    Date published: 2016-08-05
    Rated 5 out of 5 by from Sudden death for ants I've used the Terro liquid antkiller for years. Whenever I set out a few dabs ants are soon fighting with each other to get their fair share. Astoundingly more effective than all the more expensive fancy treatments.
    Date published: 2016-07-26
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    Is this product effective against fire ants?

    Asked by: Mysteriouscalm
    This product is not recommended for fire ants. Instead, we suggest one of the products found at the web address below. http://www.terro.com/search?Ntt=fire+ants
    Answered by: Consumer Relations
    Date published: 2016-10-25

    Do I have to replace the bait traps everyday or are they good for a few days? I'm using the Terro Ant Kill Liquid.

    Asked by: Anonymous
    While the bait does not need to be replaced daily, we recommend adding a few drops to the cardboard squares each day to prevent the liquid from drying.
    Answered by: Consumer Relations
    Date published: 2016-10-25

    I'm out of the waxed cardboard squares what can i use instead ?ty

    Asked by: Lisaann704
    A small piece of cardboard or tinfoil could be used as a substitute.
    Answered by: Consumer Relations
    Date published: 2016-09-07

    Can this hurt my children or dog ?

    Asked by: MrBig
    The active ingredient in our liquid ant bait is borax, which has a very low toxicity to people and pets. However, we recommend placing the bait in areas that are inaccessible to children and pets.
    Answered by: Consumer Relations
    Date published: 2016-09-07

    We applied the liquid about two weeks ago in our kitchen. The ants gathered around the drops. The numbers diminished but they are not yet gone. What next?

    Asked by: Judy
    Depending on the size of the colony, it may take several weeks to notice a sharp decrease in ant activity. We recommend keeping a supply of bait available to the ants until there are very few or no ants for a day or two. The bait can then be removed.
    Answered by: Consumer Relations
    Date published: 2016-09-02

    Should I refresh the dots of bait left out for ants now and then? How often?

    Asked by: Percy
    We recommend adding a few drops daily to ensure that the bait does not dry out, and that there is a supply of bait available for the ants. Once the number of ants has sharply decreased, the bait can be removed.
    Answered by: Consumer Relations
    Date published: 2016-09-02

    I've been putting Terri out on the bathroom counter......they just keep coming...this has been going on for at least 3 weeks....do they take this back to the nest or how is it supposed to kill them?? Does this go out of date...I feel like I'm feeding them

    Asked by: Frustrated
    I had the same thing happen to me. After the second time they returned that was the end. They have to take the food back to their queen. Be patient . What a joy it is to finally be rid of the ants.
    Answered by: Joyce 10100
    Date published: 2016-08-09

    Does the terro liquid bait expire? I have had the same bottle for 6 years and am thinking it might be less effective as it was when new (or maybe I just have a bigger ant infestation this year...)

    Asked by: Samo
    We recommend replacing the bait if it is over two years old. However, as long as it is in liquid form and attracts the ants, it will still be effective.
    Answered by: Consumer Relations
    Date published: 2016-08-06
    • 2016-10-26T11:20CST
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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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