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Ant infestation

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Posting here out of desperation to try and remove the colony of ants we have right outside our back door. We're on the east coast of Australia. Not sure what type of ants these are exactly (very small so hard to identify), but everything we've tried has failed, including a borax/sugar/water solution (soaked in cotton balls) and various ant powders/sprays. Obviously nothing has gotten to their queen to kill off the colony. There's no mound to be seen anywhere so we believe they're colonised within one of the cracks of the building. We're going mad as they quickly crawl up our feet and bite us to death when we step outside. We can't afford pest control to rid them that way either.

If there are any trade secrets that we haven't yet tried, please tell.
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Location: USDA Zone 8a
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All the ants, fire ants, and harvester ants that I have dealt with have many, many tunnels underground.  I have been putting coffee grounds in my garden and have found the coffee ground over 1000 ft from the garden.  So getting them out of your living space is possible with persistence.  Try hot boiling water or vinegar, both will kill them.  Even if you have not found the mound you should be able to find small holes where they come out.  This will not get the queen but maybe they will move away from your space.
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Location: Vilonia, Arkansas - Zone 7B/8A stoney, sandy loam soil pH 6.5
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The things I have tried and had good success with are 1. spent coffee grounds, you need to cover the mound and all around at least 1 meter from the outer edge of the mound.  make the grounds a 3 cm thick layer
2. boiling water, this is poured into the mound and then, again, all around the mound at least 1 meter from the outer edge of the mound. Use at least 20 liters per application (may take several applications in increasingly further distances from the edge of the mound)
3. Club Soda, pour into the mound at least 3 2L  bottles of club soda, this removes O2 from the ant colony and they suffocate.

The only other method I have tried with success is to introduce a large number of ants from a different colony, the battle tends to kill off many of the ants, but, it can backfire if they are the same species.


My best results were achieved by using methods 1 and 2 in succession then a few days later using number 3 method.

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Location: 18 acres & heart in zone 4 (central MN). Current abode: Knoxville (zone 6 /7)
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We use borax with sugar for ants inside. The thing is, they can consume a lot. We never use cotton balls, we just put the mixture in old lids and set them where the ants will find them and refresh as necessary. It is always slow and the ant population seems to grow at first. But with patience, eventually they depart.

Good luck! Getting bit is no fun
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